app/django/db/models/related.py
author Pawel Solyga <Pawel.Solyga@gmail.com>
Tue, 27 Jan 2009 21:56:32 +0000
changeset 1015 b9d51be5104a
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Add profiling support to Melange. By assigning profile_main_as_logs or profile_main_as_html to main variable you can turn on profiling. profile_main_as_logs will log profile data to App Engine console logs, profile_main_as_html will show profile data as html at the bottom of the page. If you want to profile app on deployed app just set the profiling function and deploy it. Patch by: Pawel Solyga Reviewed by: to-be-reviewed
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class BoundRelatedObject(object):
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    def __init__(self, related_object, field_mapping, original):
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        self.relation = related_object
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        self.field_mappings = field_mapping[related_object.name]
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    def template_name(self):
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        raise NotImplementedError
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    def __repr__(self):
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        return repr(self.__dict__)
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class RelatedObject(object):
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    def __init__(self, parent_model, model, field):
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        self.parent_model = parent_model
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        self.model = model
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        self.opts = model._meta
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        self.field = field
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        self.name = '%s:%s' % (self.opts.app_label, self.opts.module_name)
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        self.var_name = self.opts.object_name.lower()
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    def get_db_prep_lookup(self, lookup_type, value):
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        # Defer to the actual field definition for db prep
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        return self.field.get_db_prep_lookup(lookup_type, value)
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    def editable_fields(self):
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        "Get the fields in this class that should be edited inline."
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        return [f for f in self.opts.fields + self.opts.many_to_many if f.editable and f != self.field]
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    def __repr__(self):
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        return "<RelatedObject: %s related to %s>" % (self.name, self.field.name)
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    def bind(self, field_mapping, original, bound_related_object_class=BoundRelatedObject):
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        return bound_related_object_class(self, field_mapping, original)
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    def get_accessor_name(self):
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        # This method encapsulates the logic that decides what name to give an
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        # accessor descriptor that retrieves related many-to-one or
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        # many-to-many objects. It uses the lower-cased object_name + "_set",
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        # but this can be overridden with the "related_name" option.
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        if self.field.rel.multiple:
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            # If this is a symmetrical m2m relation on self, there is no reverse accessor.
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            if getattr(self.field.rel, 'symmetrical', False) and self.model == self.parent_model:
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                return None
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            return self.field.rel.related_name or (self.opts.object_name.lower() + '_set')
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        else:
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            return self.field.rel.related_name or (self.opts.object_name.lower())