diff --git a/cps/db.py b/cps/db.py
index 692b012d5..3eec6454d 100644
--- a/cps/db.py
+++ b/cps/db.py
@@ -384,14 +384,14 @@ class Custom_Columns(Base):
 
 class AlchemyEncoder(json.JSONEncoder):
 
-    def default(self, obj):
-        if isinstance(obj.__class__, DeclarativeMeta):
+    def default(self, o):
+        if isinstance(o.__class__, DeclarativeMeta):
             # an SQLAlchemy class
             fields = {}
-            for field in [x for x in dir(obj) if not x.startswith('_') and x != 'metadata']:
+            for field in [x for x in dir(o) if not x.startswith('_') and x != 'metadata']:
                 if field == 'books':
                     continue
-                data = obj.__getattribute__(field)
+                data = o.__getattribute__(field)
                 try:
                     if isinstance(data, str):
                         data = data.replace("'", "\'")
@@ -411,12 +411,12 @@ class AlchemyEncoder(json.JSONEncoder):
                     else:
                         json.dumps(data)
                     fields[field] = data
-                except:
+                except Exception:
                     fields[field] = ""
             # a json-encodable dict
             return fields
 
-        return json.JSONEncoder.default(self, obj)
+        return json.JSONEncoder.default(self, o)
 
 
 class CalibreDB():
@@ -563,8 +563,8 @@ class CalibreDB():
     def get_book_by_uuid(self, book_uuid):
         return self.session.query(Books).filter(Books.uuid == book_uuid).first()
 
-    def get_book_format(self, book_id, format):
-        return self.session.query(Data).filter(Data.book == book_id).filter(Data.format == format).first()
+    def get_book_format(self, book_id, file_format):
+        return self.session.query(Data).filter(Data.book == book_id).filter(Data.format == file_format).first()
 
     # Language and content filters for displaying in the UI
     def common_filters(self, allow_show_archived=False):
@@ -742,7 +742,7 @@ class CalibreDB():
             if old_session:
                 try:
                     old_session.close()
-                except:
+                except Exception:
                     pass
                 if old_session.bind:
                     try:
diff --git a/cps/gdrive.py b/cps/gdrive.py
index b1896bbba..950f3ce21 100644
--- a/cps/gdrive.py
+++ b/cps/gdrive.py
@@ -47,7 +47,7 @@ except ImportError as err:
 
 current_milli_time = lambda: int(round(time() * 1000))
 
-gdrive_watch_callback_token = 'target=calibreweb-watch_files'
+gdrive_watch_callback_token = 'target=calibreweb-watch_files'  #nosec
 
 
 @gdrive.route("/authenticate")
diff --git a/cps/kobo.py b/cps/kobo.py
index d019e9188..b5d5397be 100644
--- a/cps/kobo.py
+++ b/cps/kobo.py
@@ -42,8 +42,7 @@ from flask import (
 from flask_login import current_user
 from werkzeug.datastructures import Headers
 from sqlalchemy import func
-from sqlalchemy.sql.expression import and_, or_
-from sqlalchemy.orm import load_only
+from sqlalchemy.sql.expression import and_
 from sqlalchemy.exc import StatementError
 import requests
 
@@ -893,17 +892,6 @@ def HandleProductsRequest(dummy=None):
     return redirect_or_proxy_request()
 
 
-'''@kobo.errorhandler(404)
-def handle_404(err):
-    # This handler acts as a catch-all for endpoints that we don't have an interest in
-    # implementing (e.g: v1/analytics/gettests, v1/user/recommendations, etc)
-    if err:
-        print('404')
-        return jsonify(error=str(err)), 404
-    log.debug("Unknown Request received: %s, method: %s, data: %s", request.base_url, request.method, request.data)
-    return redirect_or_proxy_request()'''
-
-
 def make_calibre_web_auth_response():
     # As described in kobo_auth.py, CalibreWeb doesn't make use practical use of this auth/device API call for
     # authentation (nor for authorization). We return a dummy response just to keep the device happy.
@@ -947,7 +935,7 @@ def HandleInitRequest():
             store_response_json = store_response.json()
             if "Resources" in store_response_json:
                 kobo_resources = store_response_json["Resources"]
-        except:
+        except Exception:
             log.error("Failed to receive or parse response from Kobo's init endpoint. Falling back to un-proxied mode.")
     if not kobo_resources:
         kobo_resources = NATIVE_KOBO_RESOURCES()
diff --git a/cps/server.py b/cps/server.py
index 87d1b3020..a4027525e 100644
--- a/cps/server.py
+++ b/cps/server.py
@@ -138,7 +138,7 @@ class WebServer(object):
         return sock, _readable_listen_address(*address)
 
     @staticmethod
-    def _get_args_for_reloading(self):
+    def _get_args_for_reloading():
         """Determine how the script was executed, and return the args needed
         to execute it again in a new process.
         Code from https://github.com/pyload/pyload. Author GammaC0de, voulter
diff --git a/cps/static/css/caliBlur_override.css b/cps/static/css/caliBlur_override.css
index 2f3dcb586..4c8b6cb07 100644
--- a/cps/static/css/caliBlur_override.css
+++ b/cps/static/css/caliBlur_override.css
@@ -1,8 +1,8 @@
-body.serieslist.grid-view div.container-fluid > div > div.col-sm-10:before{
+body.serieslist.grid-view div.container-fluid > div > div.col-sm-10::before {
   display: none;
 }
 
-.cover .badge{
+.cover .badge {
   position: absolute;
   top: 0;
   left: 0;
@@ -10,15 +10,15 @@ body.serieslist.grid-view div.container-fluid > div > div.col-sm-10:before{
   background-color: #cc7b19;
   border-radius: 0;
   padding: 0 8px;
-  box-shadow: 0 0 4px rgba(0, 0, 0, .6);
+  box-shadow: 0 0 4px rgba(0, 0, 0, 0.6);
   line-height: 24px;
 }
 
 .cover {
-  box-shadow: 0 0 4px rgba(0, 0, 0, .6);
+  box-shadow: 0 0 4px rgba(0, 0, 0, 0.6);
 }
 
 .cover .read {
-  padding: 0px 0px;
+  padding: 0 0;
   line-height: 15px;
 }
diff --git a/cps/static/css/main.css b/cps/static/css/main.css
index 217f4b811..94b04ce05 100644
--- a/cps/static/css/main.css
+++ b/cps/static/css/main.css
@@ -370,7 +370,7 @@ input:-moz-placeholder { color: #454545; }
 }
 
 #searchResults li {
-  margin-bottom:10px;
+  margin-bottom: 10px;
   width: 225px;
   font-family: Georgia, "Times New Roman", Times, serif;
   list-style: none;
diff --git a/cps/static/js/filter_grid.js b/cps/static/js/filter_grid.js
index 362c6bfa6..f5ccd3de5 100644
--- a/cps/static/js/filter_grid.js
+++ b/cps/static/js/filter_grid.js
@@ -36,7 +36,6 @@ $("#desc").click(function() {
         sortBy: "name",
         sortAscending: true
     });
-    return;
 });
 
 $("#asc").click(function() {
@@ -52,19 +51,20 @@ $("#asc").click(function() {
         sortBy: "name",
         sortAscending: false
     });
-    return;
 });
 
 $("#all").click(function() {
     // go through all elements and make them visible
     $list.isotope({ filter: function() {
-        return true;
-      } })
+            return true;
+        }
+    });
 });
 
 $(".char").click(function() {
     var character = this.innerText;
     $list.isotope({ filter: function() {
-        return this.attributes["data-id"].value.charAt(0).toUpperCase() == character;
-      } })
+            return this.attributes["data-id"].value.charAt(0).toUpperCase() == character;
+        }
+    });
 });
diff --git a/cps/static/js/get_meta.js b/cps/static/js/get_meta.js
index d3e0eb46f..04c1d2704 100644
--- a/cps/static/js/get_meta.js
+++ b/cps/static/js/get_meta.js
@@ -138,8 +138,8 @@ $(function () {
                         seriesTitle = result.series.title;
                     }
                     var dateFomers = result.pubdate.split("-");
-                    var publishedYear = parseInt(dateFomers[0]);
-                    var publishedMonth = parseInt(dateFomers[1]);
+                    var publishedYear = parseInt(dateFomers[0], 10);
+                    var publishedMonth = parseInt(dateFomers[1], 10);
                     var publishedDate = new Date(publishedYear, publishedMonth - 1, 1);
 
                     publishedDate = formatDate(publishedDate);
@@ -194,8 +194,8 @@ $(function () {
                     } else {
                         dateFomers = result.date_added.split("-");
                     }
-                    var publishedYear = parseInt(dateFomers[0]);
-                    var publishedMonth = parseInt(dateFomers[1]);
+                    var publishedYear = parseInt(dateFomers[0], 10);
+                    var publishedMonth = parseInt(dateFomers[1], 10);
                     var publishedDate = new Date(publishedYear, publishedMonth - 1, 1);
 
                     publishedDate = formatDate(publishedDate);
diff --git a/cps/static/js/main.js b/cps/static/js/main.js
index 834e1b17f..ba6f726f6 100644
--- a/cps/static/js/main.js
+++ b/cps/static/js/main.js
@@ -114,7 +114,7 @@ $(document).ready(function() {
   }
 });
 
-function ConfirmDialog(id, dataValue, yesFn, noFn) {
+function confirmDialog(id, dataValue, yesFn, noFn) {
     var $confirm = $("#GeneralDeleteModal");
     // var dataValue= e.data('value'); // target.data('value');
     $confirm.modal('show');
@@ -481,7 +481,7 @@ $(function() {
         });
 
     $("#config_delete_kobo_token").click(function() {
-        ConfirmDialog(
+        confirmDialog(
             $(this).attr('id'),
             $(this).data('value'),
             function (value) {
@@ -509,7 +509,7 @@ $(function() {
     });
 
     $("#btndeluser").click(function() {
-        ConfirmDialog(
+        confirmDialog(
             $(this).attr('id'),
             $(this).data('value'),
             function(value){
@@ -527,7 +527,7 @@ $(function() {
     });
 
     $("#delete_shelf").click(function() {
-        ConfirmDialog(
+        confirmDialog(
             $(this).attr('id'),
             $(this).data('value'),
             function(value){
diff --git a/cps/static/js/table.js b/cps/static/js/table.js
index f4c4d5fe4..0dd62b2b1 100644
--- a/cps/static/js/table.js
+++ b/cps/static/js/table.js
@@ -16,7 +16,7 @@
  */
 
 /* exported TableActions, RestrictionActions, EbookActions, responseHandler */
-/* global getPath, ConfirmDialog */
+/* global getPath, confirmDialog */
 
 var selections = [];
 
@@ -210,7 +210,7 @@ $(function() {
         striped: false
     });
 
-    function domain_handle(domainId) {
+    function domainHandle(domainId) {
         $.ajax({
             method:"post",
             url: window.location.pathname + "/../../ajax/deletedomain",
@@ -237,12 +237,12 @@ $(function() {
     }
     $("#domain-allow-table").on("click-cell.bs.table", function (field, value, row, $element) {
         if (value === 2) {
-            ConfirmDialog("btndeletedomain", $element.id, domain_handle);
+            confirmDialog("btndeletedomain", $element.id, domainHandle);
         }
     });
     $("#domain-deny-table").on("click-cell.bs.table", function (field, value, row, $element) {
         if (value === 2) {
-            ConfirmDialog("btndeletedomain", $element.id, domain_handle);
+            confirmDialog("btndeletedomain", $element.id, domainHandle);
         }
     });
 
@@ -256,12 +256,12 @@ $(function() {
         $("#h3").addClass("hidden");
         $("#h4").addClass("hidden");
     });
-    function startTable(type, user_id) {
+    function startTable(type, userId) {
         $("#restrict-elements-table").bootstrapTable({
             formatNoMatches: function () {
                 return "";
             },
-            url: getPath() + "/ajax/listrestriction/" + type + "/" + user_id,
+            url: getPath() + "/ajax/listrestriction/" + type + "/" + userId,
             rowStyle: function(row) {
                 // console.log('Reihe :' + row + " Index :" + index);
                 if (row.id.charAt(0) === "a") {
@@ -275,13 +275,13 @@ $(function() {
                     $.ajax ({
                         type: "Post",
                         data: "id=" + row.id + "&type=" + row.type + "&Element=" + encodeURIComponent(row.Element),
-                        url: getPath() + "/ajax/deleterestriction/" + type + "/" + user_id,
+                        url: getPath() + "/ajax/deleterestriction/" + type + "/" + userId,
                         async: true,
                         timeout: 900,
                         success:function() {
                             $.ajax({
                                 method:"get",
-                                url: getPath() + "/ajax/listrestriction/" + type + "/" + user_id,
+                                url: getPath() + "/ajax/listrestriction/" + type + "/" + userId,
                                 async: true,
                                 timeout: 900,
                                 success:function(data) {
@@ -297,7 +297,7 @@ $(function() {
         $("#restrict-elements-table").removeClass("table-hover");
         $("#restrict-elements-table").on("editable-save.bs.table", function (e, field, row) {
             $.ajax({
-                url: getPath() + "/ajax/editrestriction/" + type + "/" + user_id,
+                url: getPath() + "/ajax/editrestriction/" + type + "/" + userId,
                 type: "Post",
                 data: row
             });
@@ -305,13 +305,13 @@ $(function() {
         $("[id^=submit_]").click(function() {
             $(this)[0].blur();
             $.ajax({
-                url: getPath() + "/ajax/addrestriction/" + type + "/" + user_id,
+                url: getPath() + "/ajax/addrestriction/" + type + "/" + userId,
                 type: "Post",
                 data: $(this).closest("form").serialize() + "&" + $(this)[0].name + "=",
                 success: function () {
                     $.ajax ({
                         method:"get",
-                        url: getPath() + "/ajax/listrestriction/" + type + "/" + user_id,
+                        url: getPath() + "/ajax/listrestriction/" + type + "/" + userId,
                         async: true,
                         timeout: 900,
                         success:function(data) {
@@ -333,12 +333,12 @@ $(function() {
         $("#h1").removeClass("hidden");
     });
     $("#get_user_column_values").on("click", function() {
-        startTable(3, $(this).data('id'));
+        startTable(3, $(this).data("id"));
         $("#h4").removeClass("hidden");
     });
 
     $("#get_user_tags").on("click", function() {
-        startTable(2,  $(this).data('id'));
+        startTable(2,  $(this).data("id"));
         $(this)[0].blur();
         $("#h3").removeClass("hidden");
     });
diff --git a/cps/ub.py b/cps/ub.py
index b97e0670e..967ac0c52 100644
--- a/cps/ub.py
+++ b/cps/ub.py
@@ -610,7 +610,7 @@ def migrate_Database(session):
                      "locale VARCHAR(2),"
                      "sidebar_view INTEGER,"
                      "default_language VARCHAR(3),"
-                     "view_settings VARCHAR,"               
+                     "view_settings VARCHAR,"
                      "UNIQUE (nickname),"
                      "UNIQUE (email))")
             conn.execute("INSERT INTO user_id(id, nickname, email, role, password, kindle_mail,locale,"
diff --git a/cps/updater.py b/cps/updater.py
index 5ef060efe..a9dcfa03b 100644
--- a/cps/updater.py
+++ b/cps/updater.py
@@ -272,7 +272,8 @@ class Updater(threading.Thread):
                     log.debug("Could not remove: %s", item_path)
         shutil.rmtree(source, ignore_errors=True)
 
-    def is_venv(self):
+    @staticmethod
+    def is_venv():
         if (hasattr(sys, 'real_prefix')) or (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix):
             return os.sep + os.path.relpath(sys.prefix, constants.BASE_DIR)
         else:
diff --git a/cps/web.py b/cps/web.py
index 0349b3327..c62177fcd 100644
--- a/cps/web.py
+++ b/cps/web.py
@@ -373,23 +373,9 @@ def render_books_list(data, sort, book_id, page):
     order = get_sort_function(sort, data)
 
     if data == "rated":
-        if current_user.check_visibility(constants.SIDEBAR_BEST_RATED):
-            entries, random, pagination = calibre_db.fill_indexpage(page, 0,
-                                                                    db.Books,
-                                                                    db.Books.ratings.any(db.Ratings.rating > 9),
-                                                                    order)
-            return render_title_template('index.html', random=random, entries=entries, pagination=pagination,
-                                         id=book_id, title=_(u"Top Rated Books"), page="rated")
-        else:
-            abort(404)
+        return render_rated_books(page, book_id, order=order)
     elif data == "discover":
-        if current_user.check_visibility(constants.SIDEBAR_RANDOM):
-            entries, __, pagination = calibre_db.fill_indexpage(page, 0, db.Books, True, [func.randomblob(2)])
-            pagination = Pagination(1, config.config_books_per_page, config.config_books_per_page)
-            return render_title_template('discover.html', entries=entries, pagination=pagination, id=book_id,
-                                         title=_(u"Discover (Random Books)"), page="discover")
-        else:
-            abort(404)
+        return render_discover_books(page, book_id)
     elif data == "unread":
         return render_read_books(page, False, order=order)
     elif data == "read":
@@ -429,6 +415,27 @@ def render_books_list(data, sort, book_id, page):
                                      title=_(u"Books"), page=website)
 
 
+def render_rated_books(page, book_id, order):
+    if current_user.check_visibility(constants.SIDEBAR_BEST_RATED):
+        entries, random, pagination = calibre_db.fill_indexpage(page, 0,
+                                                                db.Books,
+                                                                db.Books.ratings.any(db.Ratings.rating > 9),
+                                                                order)
+        return render_title_template('index.html', random=random, entries=entries, pagination=pagination,
+                                     id=book_id, title=_(u"Top Rated Books"), page="rated")
+    else:
+        abort(404)
+
+
+def render_discover_books(page, book_id):
+    if current_user.check_visibility(constants.SIDEBAR_RANDOM):
+        entries, __, pagination = calibre_db.fill_indexpage(page, 0, db.Books, True, [func.randomblob(2)])
+        pagination = Pagination(1, config.config_books_per_page, config.config_books_per_page)
+        return render_title_template('discover.html', entries=entries, pagination=pagination, id=book_id,
+                                     title=_(u"Discover (Random Books)"), page="discover")
+    else:
+        abort(404)
+
 def render_hot_books(page):
     if current_user.check_visibility(constants.SIDEBAR_HOT):
         if current_user.show_detail_random():
@@ -990,6 +997,149 @@ def advanced_search():
     return redirect(url_for('web.books_list', data="advsearch", sort_param='stored', query=""))
 
 
+def adv_search_custom_columns(cc, term, q):
+    for c in cc:
+        custom_query = term.get('custom_column_' + str(c.id))
+        if custom_query != '' and custom_query is not None:
+            if c.datatype == 'bool':
+                q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
+                    db.cc_classes[c.id].value == (custom_query == "True")))
+            elif c.datatype == 'int' or c.datatype == 'float':
+                q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
+                    db.cc_classes[c.id].value == custom_query))
+            elif c.datatype == 'rating':
+                q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
+                    db.cc_classes[c.id].value == int(float(custom_query) * 2)))
+            else:
+                q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
+                    func.lower(db.cc_classes[c.id].value).ilike("%" + custom_query + "%")))
+    return q
+
+
+def adv_search_language(q, include_languages_inputs, exclude_languages_inputs):
+    if current_user.filter_language() != "all":
+        q = q.filter(db.Books.languages.any(db.Languages.lang_code == current_user.filter_language()))
+    else:
+        for language in include_languages_inputs:
+            q = q.filter(db.Books.languages.any(db.Languages.id == language))
+        for language in exclude_languages_inputs:
+            q = q.filter(not_(db.Books.series.any(db.Languages.id == language)))
+    return q
+
+
+def adv_search_ratings(q, rating_high, rating_low):
+    if rating_high:
+        rating_high = int(rating_high) * 2
+        q = q.filter(db.Books.ratings.any(db.Ratings.rating <= rating_high))
+    if rating_low:
+        rating_low = int(rating_low) * 2
+        q = q.filter(db.Books.ratings.any(db.Ratings.rating >= rating_low))
+    return q
+
+
+def adv_search_read_status(q, read_status):
+    if read_status:
+        if config.config_read_column:
+            if read_status == "True":
+                q = q.join(db.cc_classes[config.config_read_column], isouter=True) \
+                    .filter(db.cc_classes[config.config_read_column].value == True)
+            else:
+                q = q.join(db.cc_classes[config.config_read_column], isouter=True) \
+                    .filter(coalesce(db.cc_classes[config.config_read_column].value, False) != True)
+        else:
+            if read_status == "True":
+                q = q.join(ub.ReadBook, db.Books.id == ub.ReadBook.book_id, isouter=True) \
+                    .filter(ub.ReadBook.user_id == int(current_user.id),
+                            ub.ReadBook.read_status == ub.ReadBook.STATUS_FINISHED)
+            else:
+                q = q.join(ub.ReadBook, db.Books.id == ub.ReadBook.book_id, isouter=True) \
+                    .filter(ub.ReadBook.user_id == int(current_user.id),
+                            coalesce(ub.ReadBook.read_status, 0) != ub.ReadBook.STATUS_FINISHED)
+    return q
+
+
+def adv_search_extension(q, include_extension_inputs, exclude_extension_inputs):
+    for extension in include_extension_inputs:
+        q = q.filter(db.Books.data.any(db.Data.format == extension))
+    for extension in exclude_extension_inputs:
+        q = q.filter(not_(db.Books.data.any(db.Data.format == extension)))
+    return q
+
+
+def adv_search_tag(q, include_tag_inputs, exclude_tag_inputs):
+    for tag in include_tag_inputs:
+        q = q.filter(db.Books.tags.any(db.Tags.id == tag))
+    for tag in exclude_tag_inputs:
+        q = q.filter(not_(db.Books.tags.any(db.Tags.id == tag)))
+    return q
+
+
+def adv_search_serie(q, include_series_inputs, exclude_series_inputs):
+    for serie in include_series_inputs:
+        q = q.filter(db.Books.series.any(db.Series.id == serie))
+    for serie in exclude_series_inputs:
+        q = q.filter(not_(db.Books.series.any(db.Series.id == serie)))
+    return q
+
+
+def extend_search_term(searchterm,
+                       author_name,
+                       book_title,
+                       publisher,
+                       pub_start,
+                       pub_end,
+                       include_tag_inputs,
+                       exclude_tag_inputs,
+                       include_series_inputs,
+                       exclude_series_inputs,
+                       include_languages_inputs,
+                       rating_high,
+                       rating_low,
+                       read_status,
+                       include_extension_inputs,
+                       exclude_extension_inputs
+                       ):
+    searchterm.extend((author_name.replace('|', ','), book_title, publisher))
+    if pub_start:
+        try:
+            searchterm.extend([_(u"Published after ") +
+                               format_date(datetime.strptime(pub_start, "%Y-%m-%d"),
+                                           format='medium', locale=get_locale())])
+        except ValueError:
+            pub_start = u""
+    if pub_end:
+        try:
+            searchterm.extend([_(u"Published before ") +
+                               format_date(datetime.strptime(pub_end, "%Y-%m-%d"),
+                                           format='medium', locale=get_locale())])
+        except ValueError:
+            pub_start = u""
+    tag_names = calibre_db.session.query(db.Tags).filter(db.Tags.id.in_(include_tag_inputs)).all()
+    searchterm.extend(tag.name for tag in tag_names)
+    tag_names = calibre_db.session.query(db.Tags).filter(db.Tags.id.in_(exclude_tag_inputs)).all()
+    searchterm.extend(tag.name for tag in tag_names)
+    serie_names = calibre_db.session.query(db.Series).filter(db.Series.id.in_(include_series_inputs)).all()
+    searchterm.extend(serie.name for serie in serie_names)
+    serie_names = calibre_db.session.query(db.Series).filter(db.Series.id.in_(exclude_series_inputs)).all()
+    searchterm.extend(serie.name for serie in serie_names)
+    language_names = calibre_db.session.query(db.Languages). \
+        filter(db.Languages.id.in_(include_languages_inputs)).all()
+    if language_names:
+        language_names = calibre_db.speaking_language(language_names)
+    searchterm.extend(language.name for language in language_names)
+    if rating_high:
+        searchterm.extend([_(u"Rating <= %(rating)s", rating=rating_high)])
+    if rating_low:
+        searchterm.extend([_(u"Rating >= %(rating)s", rating=rating_low)])
+    if read_status:
+        searchterm.extend([_(u"Read Status = %(status)s", status=read_status)])
+    searchterm.extend(ext for ext in include_extension_inputs)
+    searchterm.extend(ext for ext in exclude_extension_inputs)
+    # handle custom columns
+    searchterm = " + ".join(filter(None, searchterm))
+    return searchterm, pub_start, pub_end
+
+
 def render_adv_search_results(term, offset=None, order=None, limit=None):
     order = order or [db.Books.sort]
     pagination = None
@@ -1034,47 +1184,22 @@ def render_adv_search_results(term, offset=None, order=None, limit=None):
             include_languages_inputs or exclude_languages_inputs or author_name or book_title or \
             publisher or pub_start or pub_end or rating_low or rating_high or description or cc_present or \
             include_extension_inputs or exclude_extension_inputs or read_status:
-        searchterm.extend((author_name.replace('|', ','), book_title, publisher))
-        if pub_start:
-            try:
-                searchterm.extend([_(u"Published after ") +
-                                   format_date(datetime.strptime(pub_start, "%Y-%m-%d"),
-                                               format='medium', locale=get_locale())])
-            except ValueError:
-                pub_start = u""
-        if pub_end:
-            try:
-                searchterm.extend([_(u"Published before ") +
-                                   format_date(datetime.strptime(pub_end, "%Y-%m-%d"),
-                                               format='medium', locale=get_locale())])
-            except ValueError:
-                pub_start = u""
-        tag_names = calibre_db.session.query(db.Tags).filter(db.Tags.id.in_(include_tag_inputs)).all()
-        searchterm.extend(tag.name for tag in tag_names)
-        tag_names = calibre_db.session.query(db.Tags).filter(db.Tags.id.in_(exclude_tag_inputs)).all()
-        searchterm.extend(tag.name for tag in tag_names)
-        serie_names = calibre_db.session.query(db.Series).filter(db.Series.id.in_(include_series_inputs)).all()
-        searchterm.extend(serie.name for serie in serie_names)
-        serie_names = calibre_db.session.query(db.Series).filter(db.Series.id.in_(exclude_series_inputs)).all()
-        searchterm.extend(serie.name for serie in serie_names)
-        language_names = calibre_db.session.query(db.Languages).\
-            filter(db.Languages.id.in_(include_languages_inputs)).all()
-        if language_names:
-            language_names = calibre_db.speaking_language(language_names)
-        searchterm.extend(language.name for language in language_names)
-        if rating_high:
-            searchterm.extend([_(u"Rating <= %(rating)s", rating=rating_high)])
-        if rating_low:
-            searchterm.extend([_(u"Rating >= %(rating)s", rating=rating_low)])
-        if read_status:
-            searchterm.extend([_(u"Read Status = %(status)s", status=read_status)])
-        searchterm.extend(ext for ext in include_extension_inputs)
-        searchterm.extend(ext for ext in exclude_extension_inputs)
-        # handle custom columns
-        #for c in cc:
-        #    if term.get('custom_column_' + str(c.id)):
-        #        searchterm.extend([(u"%s: %s" % (c.name, term.get('custom_column_' + str(c.id))))])
-        searchterm = " + ".join(filter(None, searchterm))
+        searchterm, pub_start, pub_end = extend_search_term(searchterm,
+                                                            author_name,
+                                                            book_title,
+                                                            publisher,
+                                                            pub_start,
+                                                            pub_end,
+                                                            include_tag_inputs,
+                                                            exclude_tag_inputs,
+                                                            include_series_inputs,
+                                                            exclude_series_inputs,
+                                                            include_languages_inputs,
+                                                            rating_high,
+                                                            rating_low,
+                                                            read_status,
+                                                            include_extension_inputs,
+                                                            exclude_extension_inputs)
         q = q.filter()
         if author_name:
             q = q.filter(db.Books.authors.any(func.lower(db.Authors.name).ilike("%" + author_name + "%")))
@@ -1084,73 +1209,24 @@ def render_adv_search_results(term, offset=None, order=None, limit=None):
             q = q.filter(db.Books.pubdate >= pub_start)
         if pub_end:
             q = q.filter(db.Books.pubdate <= pub_end)
-        if read_status:
-            if config.config_read_column:
-                if read_status=="True":
-                    q = q.join(db.cc_classes[config.config_read_column], isouter=True) \
-                        .filter(db.cc_classes[config.config_read_column].value == True)
-                else:
-                    q = q.join(db.cc_classes[config.config_read_column], isouter=True) \
-                        .filter(coalesce(db.cc_classes[config.config_read_column].value, False) != True)
-            else:
-                if read_status == "True":
-                    q = q.join(ub.ReadBook, db.Books.id==ub.ReadBook.book_id, isouter=True)\
-                        .filter(ub.ReadBook.user_id == int(current_user.id),
-                                ub.ReadBook.read_status == ub.ReadBook.STATUS_FINISHED)
-                else:
-                    q = q.join(ub.ReadBook, db.Books.id == ub.ReadBook.book_id, isouter=True) \
-                        .filter(ub.ReadBook.user_id == int(current_user.id),
-                                coalesce(ub.ReadBook.read_status, 0) != ub.ReadBook.STATUS_FINISHED)
+        q = adv_search_read_status(q, read_status)
         if publisher:
             q = q.filter(db.Books.publishers.any(func.lower(db.Publishers.name).ilike("%" + publisher + "%")))
-        for tag in include_tag_inputs:
-            q = q.filter(db.Books.tags.any(db.Tags.id == tag))
-        for tag in exclude_tag_inputs:
-            q = q.filter(not_(db.Books.tags.any(db.Tags.id == tag)))
-        for serie in include_series_inputs:
-            q = q.filter(db.Books.series.any(db.Series.id == serie))
-        for serie in exclude_series_inputs:
-            q = q.filter(not_(db.Books.series.any(db.Series.id == serie)))
-        for extension in include_extension_inputs:
-            q = q.filter(db.Books.data.any(db.Data.format == extension))
-        for extension in exclude_extension_inputs:
-            q = q.filter(not_(db.Books.data.any(db.Data.format == extension)))
-        if current_user.filter_language() != "all":
-            q = q.filter(db.Books.languages.any(db.Languages.lang_code == current_user.filter_language()))
-        else:
-            for language in include_languages_inputs:
-                q = q.filter(db.Books.languages.any(db.Languages.id == language))
-            for language in exclude_languages_inputs:
-                q = q.filter(not_(db.Books.series.any(db.Languages.id == language)))
-        if rating_high:
-            rating_high = int(rating_high) * 2
-            q = q.filter(db.Books.ratings.any(db.Ratings.rating <= rating_high))
-        if rating_low:
-            rating_low = int(rating_low) * 2
-            q = q.filter(db.Books.ratings.any(db.Ratings.rating >= rating_low))
+        q = adv_search_tag(q, include_tag_inputs, exclude_tag_inputs)
+        q = adv_search_serie(q, include_series_inputs, exclude_series_inputs)
+        q = adv_search_extension(q, include_extension_inputs, exclude_extension_inputs)
+        q = adv_search_language(q, include_languages_inputs, exclude_languages_inputs)
+        q = adv_search_ratings(q, rating_high, rating_low)
+
         if description:
             q = q.filter(db.Books.comments.any(func.lower(db.Comments.text).ilike("%" + description + "%")))
 
         # search custom culumns
-        for c in cc:
-            custom_query = term.get('custom_column_' + str(c.id))
-            if custom_query != '' and custom_query is not None:
-                if c.datatype == 'bool':
-                    q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
-                        db.cc_classes[c.id].value == (custom_query == "True")))
-                elif c.datatype == 'int' or c.datatype == 'float':
-                    q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
-                        db.cc_classes[c.id].value == custom_query))
-                elif c.datatype == 'rating':
-                    q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
-                        db.cc_classes[c.id].value == int(float(custom_query) * 2)))
-                else:
-                    q = q.filter(getattr(db.Books, 'custom_column_' + str(c.id)).any(
-                        func.lower(db.cc_classes[c.id].value).ilike("%" + custom_query + "%")))
+        q = adv_search_custom_columns(cc, term, q)
+
     q = q.order_by(*order).all()
     flask_session['query'] = json.dumps(term)
     ub.store_ids(q)
-    # entries, result_count, pagination = calibre_db.get_search_results(term, offset, order, limit)
     result_count = len(q)
     if offset != None and limit != None:
         offset = int(offset)
@@ -1409,16 +1485,7 @@ def logout():
 
 
 # ################################### Users own configuration #########################################################
-def change_profile(kobo_support, local_oauth_check, oauth_status, translations, languages):
-    to_save = request.form.to_dict()
-    current_user.random_books = 0
-    if current_user.role_passwd() or current_user.role_admin():
-        if "password" in to_save and to_save["password"]:
-            current_user.password = generate_password_hash(to_save["password"])
-    if "kindle_mail" in to_save and to_save["kindle_mail"] != current_user.kindle_mail:
-        current_user.kindle_mail = to_save["kindle_mail"]
-    if "allowed_tags" in to_save and to_save["allowed_tags"] != current_user.allowed_tags:
-        current_user.allowed_tags = to_save["allowed_tags"].strip()
+def change_profile_email(to_save, kobo_support, local_oauth_check, oauth_status):
     if "email" in to_save and to_save["email"] != current_user.email:
         if config.config_public_reg and not check_valid_domain(to_save["email"]):
             flash(_(u"E-mail is not from valid domain"), category="error")
@@ -1427,6 +1494,8 @@ def change_profile(kobo_support, local_oauth_check, oauth_status, translations,
                                          kobo_support=kobo_support,
                                          registered_oauth=local_oauth_check, oauth_status=oauth_status)
         current_user.email = to_save["email"]
+
+def change_profile_nickname(to_save, kobo_support, local_oauth_check, translations, languages):
     if "nickname" in to_save and to_save["nickname"] != current_user.nickname:
         # Query User nickname, if not existing, change
         if not ub.session.query(ub.User).filter(ub.User.nickname == to_save["nickname"]).scalar():
@@ -1442,6 +1511,20 @@ def change_profile(kobo_support, local_oauth_check, oauth_status, translations,
                                          title=_(u"Edit User %(nick)s",
                                                  nick=current_user.nickname),
                                          page="edituser")
+
+
+def change_profile(kobo_support, local_oauth_check, oauth_status, translations, languages):
+    to_save = request.form.to_dict()
+    current_user.random_books = 0
+    if current_user.role_passwd() or current_user.role_admin():
+        if "password" in to_save and to_save["password"]:
+            current_user.password = generate_password_hash(to_save["password"])
+    if "kindle_mail" in to_save and to_save["kindle_mail"] != current_user.kindle_mail:
+        current_user.kindle_mail = to_save["kindle_mail"]
+    if "allowed_tags" in to_save and to_save["allowed_tags"] != current_user.allowed_tags:
+        current_user.allowed_tags = to_save["allowed_tags"].strip()
+    change_profile_email(to_save, kobo_support, local_oauth_check, oauth_status)
+    change_profile_nickname(to_save, kobo_support, local_oauth_check, translations, languages)
     if "show_random" in to_save and to_save["show_random"] == "on":
         current_user.random_books = 1
     if "default_language" in to_save: