# Buggy code
def loadSettings(self):
    data = session.query(Settings).first()  # type: Settings

    self.config_calibre_dir = data.config_calibre_dir
    self.config_port = data.config_port
    self.config_certfile = data.config_certfile
    self.config_keyfile = data.config_keyfile
    self.config_calibre_web_title = data.config_calibre_web_title
    self.config_books_per_page = data.config_books_per_page
    self.config_random_books = data.config_random_books
    self.config_title_regex = data.config_title_regex
    self.config_read_column = data.config_read_column
    self.config_log_level = data.config_log_level
    self.config_uploading = data.config_uploading
    self.config_anonbrowse = data.config_anonbrowse
    self.config_public_reg = data.config_public_reg
    self.config_default_role = data.config_default_role
    self.config_default_show = data.config_default_show
    self.config_columns_to_ignore = data.config_columns_to_ignore
    self.config_use_google_drive = data.config_use_google_drive
    self.config_google_drive_folder = data.config_google_drive_folder
    self.config_ebookconverter = data.config_ebookconverter
    self.config_converterpath = data.config_converterpath
    self.config_calibre = data.config_calibre
    if data.config_google_drive_watch_changes_response:
        self.config_google_drive_watch_changes_response = json.loads(
            data.config_google_drive_watch_changes_response
        )
    else:
        self.config_google_drive_watch_changes_response = None
    self.config_columns_to_ignore = data.config_columns_to_ignore
    self.db_configured = bool(
        self.config_calibre_dir is not None
        and (
            not self.config_use_google_drive
            or os.path.exists(self.config_calibre_dir + "/metadata.db")
        )
    )
    self.config_remote_login = data.config_remote_login
    self.config_use_goodreads = data.config_use_goodreads
    self.config_goodreads_api_key = data.config_goodreads_api_key
    self.config_goodreads_api_secret = data.config_goodreads_api_secret
    if data.config_mature_content_tags:
        self.config_mature_content_tags = data.config_mature_content_tags
    else:
        self.config_mature_content_tags = ""
    if data.config_logfile:
        self.config_logfile = data.config_logfile
    self.config_rarfile_location = data.config_rarfile_location


# Traceback (OperationalError)
ERROR:cps.web:Exception on /book/125 [GET]
Traceback (most recent call last):
File "/Users/jgillman/Code/calibre-web/vendor/flask/app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "/Users/jgillman/Code/calibre-web/vendor/flask/app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/Users/jgillman/Code/calibre-web/vendor/flask/app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/Users/jgillman/Code/calibre-web/vendor/flask/app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "/Users/jgillman/Code/calibre-web/vendor/flask/app.py", line 1461, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/jgillman/Code/calibre-web/vendor/flask_login.py", line 717, in decorated_view
return func(*args, **kwargs)
File "/Users/jgillman/Code/calibre-web/cps/web.py", line 381, in show_book
return render_template('detail.html', entry=entries,  cc=cc, title=entries.title, books_shelfs=book_in_shelfs)
File "/Users/jgillman/Code/calibre-web/vendor/flask/templating.py", line 128, in render_template
context, ctx.app)
File "/Users/jgillman/Code/calibre-web/vendor/flask/templating.py", line 110, in _render
rv = template.render(context)
File "/Users/jgillman/Code/calibre-web/vendor/jinja2/environment.py", line 969, in render
return self.environment.handle_exception(exc_info, True)
File "/Users/jgillman/Code/calibre-web/vendor/jinja2/environment.py", line 742, in handle_exception
reraise(exc_type, exc_value, tb)
File "/Users/jgillman/Code/calibre-web/cps/templates/detail.html", line 1, in top-level template code
{% extends "layout.html" %}
File "/Users/jgillman/Code/calibre-web/cps/templates/layout.html", line 136, in top-level template code
{% block body %}{% endblock %}
File "/Users/jgillman/Code/calibre-web/cps/templates/detail.html", line 66, in block "body"
{% if entry['custom_column_' ~ c.id]|length > 0 %}
File "/Users/jgillman/Code/calibre-web/vendor/jinja2/environment.py", line 387, in getitem
return getattr(obj, attr)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/attributes.py", line 316, in __get__
return self.impl.get(instance_state(instance), dict_)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/attributes.py", line 613, in get
value = self.callable_(state, passive)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/strategies.py", line 524, in _load_for_state
return self._emit_lazyload(session, state, ident_key, passive)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/strategies.py", line 585, in _emit_lazyload
result = q.all()
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/query.py", line 2241, in all
return list(self)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/query.py", line 2353, in __iter__
return self._execute_and_instances(context)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/orm/query.py", line 2368, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/engine/base.py", line 662, in execute
params)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/engine/base.py", line 761, in _execute_clauseelement
compiled_sql, distilled_params
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/engine/base.py", line 874, in _execute_context
context)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/engine/base.py", line 1024, in _handle_dbapi_exception
exc_info
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/util/compat.py", line 196, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/engine/base.py", line 867, in _execute_context
context)
File "/Users/jgillman/Code/calibre-web/vendor/sqlalchemy/engine/default.py", line 324, in do_execute
cursor.execute(statement, parameters)
OperationalError: (OperationalError) no such table: books_custom_column_1_link u'SELECT custom_column_1.id AS custom_column_1_id, custom_column_1.value AS custom_column_1_value \
nFROM custom_column_1, books_custom_column_1_link \nWHERE ? = books_custom_column_1_link.book AND custom_column_1.id = books_custom_column_1_link.value' (125,)
ERROR:tornado.access:500 GET /book/125 (::1) 89.60ms

# Fixed code
def loadSettings(self):
    data = session.query(Settings).first()  # type: Settings

    self.config_calibre_dir = data.config_calibre_dir
    self.config_port = data.config_port
    self.config_certfile = data.config_certfile
    self.config_keyfile = data.config_keyfile
    self.config_calibre_web_title = data.config_calibre_web_title
    self.config_books_per_page = data.config_books_per_page
    self.config_random_books = data.config_random_books
    self.config_authors_max = data.config_authors_max
    self.config_title_regex = data.config_title_regex
    self.config_read_column = data.config_read_column
    self.config_log_level = data.config_log_level
    self.config_uploading = data.config_uploading
    self.config_anonbrowse = data.config_anonbrowse
    self.config_public_reg = data.config_public_reg
    self.config_default_role = data.config_default_role
    self.config_default_show = data.config_default_show
    self.config_columns_to_ignore = data.config_columns_to_ignore
    self.config_use_google_drive = data.config_use_google_drive
    self.config_google_drive_folder = data.config_google_drive_folder
    self.config_ebookconverter = data.config_ebookconverter
    self.config_converterpath = data.config_converterpath
    self.config_calibre = data.config_calibre
    if data.config_google_drive_watch_changes_response:
        self.config_google_drive_watch_changes_response = json.loads(
            data.config_google_drive_watch_changes_response
        )
    else:
        self.config_google_drive_watch_changes_response = None
    self.config_columns_to_ignore = data.config_columns_to_ignore
    self.db_configured = bool(
        self.config_calibre_dir is not None
        and (
            not self.config_use_google_drive
            or os.path.exists(self.config_calibre_dir + "/metadata.db")
        )
    )
    self.config_remote_login = data.config_remote_login
    self.config_use_goodreads = data.config_use_goodreads
    self.config_goodreads_api_key = data.config_goodreads_api_key
    self.config_goodreads_api_secret = data.config_goodreads_api_secret
    if data.config_mature_content_tags:
        self.config_mature_content_tags = data.config_mature_content_tags
    else:
        self.config_mature_content_tags = ""
    if data.config_logfile:
        self.config_logfile = data.config_logfile
    self.config_rarfile_location = data.config_rarfile_location
    self.config_theme = data.config_theme
    self.config_updatechannel = data.config_updatechannel