Introduce dynamic scope_path regexps
Instead of relying on scope_path's being "one slash deep", we should
instead allow for either:
1. scope_paths that have a pre-defined depth
2. scope_paths that can be arbitrarily deep
We achieve 1 by setting an entities scope_logic to another logic
module. We then recursively call getScopeDepth until we get to the
topmost entity (that is, an unscoped entity).
A little different is the solution to 2, since some entities can have
an arbitrarily deep scope (such as Documents), we need to have some
way of signaling this to getScopePattern. A clean solution is to
return None, rather than a number. If None is returned, the
SCOPE_PATH_ARG_PATTERN is returned as regexp instead, which will
match an arbitrarily deeply nested scope.
The solution for 2 requires that we return None somewhere in the
scope_logic chain, the most straight forward method to do so is to
override getScopeDepth anywhere such a scope is needed and make it
return None. A more elegant solution however, is to set the
scope_logic to that module in all entities that require it.
Patch by: Sverre Rabbelier
"""
Dummy database backend for Django.
Django uses this if the DATABASE_ENGINE setting is empty (None or empty string).
Each of these API functions, except connection.close(), raises
ImproperlyConfigured.
"""
from django.core.exceptions import ImproperlyConfigured
from django.db.backends import *
from django.db.backends.creation import BaseDatabaseCreation
def complain(*args, **kwargs):
raise ImproperlyConfigured, "You haven't set the DATABASE_ENGINE setting yet."
def ignore(*args, **kwargs):
pass
class DatabaseError(Exception):
pass
class IntegrityError(DatabaseError):
pass
class DatabaseOperations(BaseDatabaseOperations):
quote_name = complain
class DatabaseClient(BaseDatabaseClient):
runshell = complain
class DatabaseIntrospection(BaseDatabaseIntrospection):
get_table_list = complain
get_table_description = complain
get_relations = complain
get_indexes = complain
class DatabaseWrapper(object):
operators = {}
cursor = complain
_commit = complain
_rollback = ignore
def __init__(self, *args, **kwargs):
super(DatabaseWrapper, self).__init__(*args, **kwargs)
self.features = BaseDatabaseFeatures()
self.ops = DatabaseOperations()
self.client = DatabaseClient()
self.creation = BaseDatabaseCreation(self)
self.introspection = DatabaseIntrospection(self)
self.validation = BaseDatabaseValidation()
def close(self):
pass