admin.py 文件源码

python
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项目:django 作者: alexsukhrin 项目源码 文件源码
def _check_relation(self, obj, parent_model):
        # There's no FK, but we do need to confirm that the ct_field and ct_fk_field are valid,
        # and that they are part of a GenericForeignKey.

        gfks = [
            f for f in obj.model._meta.private_fields
            if isinstance(f, GenericForeignKey)
        ]
        if len(gfks) == 0:
            return [
                checks.Error(
                    "'%s.%s' has no GenericForeignKey." % (
                        obj.model._meta.app_label, obj.model._meta.object_name
                    ),
                    obj=obj.__class__,
                    id='admin.E301'
                )
            ]
        else:
            # Check that the ct_field and ct_fk_fields exist
            try:
                obj.model._meta.get_field(obj.ct_field)
            except FieldDoesNotExist:
                return [
                    checks.Error(
                        "'ct_field' references '%s', which is not a field on '%s.%s'." % (
                            obj.ct_field, obj.model._meta.app_label, obj.model._meta.object_name
                        ),
                        obj=obj.__class__,
                        id='admin.E302'
                    )
                ]

            try:
                obj.model._meta.get_field(obj.ct_fk_field)
            except FieldDoesNotExist:
                return [
                    checks.Error(
                        "'ct_fk_field' references '%s', which is not a field on '%s.%s'." % (
                            obj.ct_fk_field, obj.model._meta.app_label, obj.model._meta.object_name
                        ),
                        obj=obj.__class__,
                        id='admin.E303'
                    )
                ]

            # There's one or more GenericForeignKeys; make sure that one of them
            # uses the right ct_field and ct_fk_field.
            for gfk in gfks:
                if gfk.ct_field == obj.ct_field and gfk.fk_field == obj.ct_fk_field:
                    return []

            return [
                checks.Error(
                    "'%s.%s' has no GenericForeignKey using content type field '%s' and object ID field '%s'." % (
                        obj.model._meta.app_label, obj.model._meta.object_name, obj.ct_field, obj.ct_fk_field
                    ),
                    obj=obj.__class__,
                    id='admin.E304'
                )
            ]
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