# Buggy code
def render_edit_book(book_id):
    db.session.connection().connection.connection.create_function(
        "title_sort", 1, db.title_sort
    )
    cc = (
        db.session.query(db.Custom_Columns)
        .filter(db.Custom_Columns.datatype.notin_(db.cc_exceptions))
        .all()
    )
    book = (
        db.session.query(db.Books)
        .filter(db.Books.id == book_id)
        .filter(common_filters())
        .first()
    )

    if not book:
        flash(
            _("Error opening eBook. File does not exist or file is not accessible"),
            category="error",
        )
        return redirect(url_for("index"))

    for indx in range(0, len(book.languages)):
        book.languages[indx].language_name = language_table[get_locale()][
            book.languages[indx].lang_code
        ]
    author_names = []
    for authr in book.authors:
        author_names.append(authr.name.replace("|", ","))

    # Option for showing convertbook button
    valid_source_formats = list()
    if config.config_ebookconverter == 2:
        for file in book.data:
            if file.format.lower() in EXTENSIONS_CONVERT:
                valid_source_formats.append(file.format.lower())

    # Determine what formats don't already exist
    allowed_conversion_formats = EXTENSIONS_CONVERT.copy()
    for file in book.data:
        try:
            allowed_conversion_formats.remove(file.format.lower())
        except Exception:
            app.logger.warning(file.format.lower() + " already removed from list.")

    return render_title_template(
        "book_edit.html",
        book=book,
        authors=author_names,
        cc=cc,
        title=_("edit metadata"),
        page="editbook",
        conversion_formats=allowed_conversion_formats,
        source_formats=valid_source_formats,
    )


# 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 render_edit_book(book_id):
    db.session.connection().connection.connection.create_function(
        "title_sort", 1, db.title_sort
    )
    cc = (
        db.session.query(db.Custom_Columns)
        .filter(db.Custom_Columns.datatype.notin_(db.cc_exceptions))
        .all()
    )
    book = (
        db.session.query(db.Books)
        .filter(db.Books.id == book_id)
        .filter(common_filters())
        .first()
    )

    if not book:
        flash(
            _("Error opening eBook. File does not exist or file is not accessible"),
            category="error",
        )
        return redirect(url_for("index"))

    for indx in range(0, len(book.languages)):
        book.languages[indx].language_name = language_table[get_locale()][
            book.languages[indx].lang_code
        ]

    book = order_authors(book)

    author_names = []
    for authr in book.authors:
        author_names.append(authr.name.replace("|", ","))

    # Option for showing convertbook button
    valid_source_formats = list()
    if config.config_ebookconverter == 2:
        for file in book.data:
            if file.format.lower() in EXTENSIONS_CONVERT:
                valid_source_formats.append(file.format.lower())

    # Determine what formats don't already exist
    allowed_conversion_formats = EXTENSIONS_CONVERT.copy()
    for file in book.data:
        try:
            allowed_conversion_formats.remove(file.format.lower())
        except Exception:
            app.logger.warning(file.format.lower() + " already removed from list.")

    return render_title_template(
        "book_edit.html",
        book=book,
        authors=author_names,
        cc=cc,
        title=_("edit metadata"),
        page="editbook",
        conversion_formats=allowed_conversion_formats,
        source_formats=valid_source_formats,
    )