python类PathInfo()的实例源码

def get_path_info(self):
        opts = self.remote_field.model._meta
        object_id_field = opts.get_field(self.object_id_field_name)
        if object_id_field.model != opts.model:
            return self._get_path_info_with_parent()
        else:
            target = opts.pk
            return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]

def get_reverse_path_info(self):
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        return [PathInfo(from_opts, opts, (opts.pk,), self, not self.unique, False)]

def _get_path_info_with_parent(self):
        """
        Return the path that joins the current model through any parent models.
        The idea is that if you have a GFK defined on a parent model then we
        need to join the parent model first, then the child model.
        """
        # With an inheritance chain ChildTag -> Tag and Tag defines the
        # GenericForeignKey, and a TaggedItem model has a GenericRelation to
        # ChildTag, then we need to generate a join from TaggedItem to Tag
        # (as Tag.object_id == TaggedItem.pk), and another join from Tag to
        # ChildTag (as that is where the relation is to). Do this by first
        # generating a join to the parent model, then generating joins to the
        # child models.
        path = []
        opts = self.remote_field.model._meta
        parent_opts = opts.get_field(self.object_id_field_name).model._meta
        target = parent_opts.pk
        path.append(PathInfo(self.model._meta, parent_opts, (target,), self.remote_field, True, False))
        # Collect joins needed for the parent -> child chain. This is easiest
        # to do if we collect joins for the child -> parent chain and then
        # reverse the direction (call to reverse() and use of
        # field.remote_field.get_path_info()).
        parent_field_chain = []
        while parent_opts != opts:
            field = opts.get_ancestor_link(parent_opts.model)
            parent_field_chain.append(field)
            opts = field.remote_field.model._meta
        parent_field_chain.reverse()
        for field in parent_field_chain:
            path.extend(field.remote_field.get_path_info())
        return path

def get_path_info(self):
        opts = self.remote_field.model._meta
        object_id_field = opts.get_field(self.object_id_field_name)
        if object_id_field.model != opts.model:
            return self._get_path_info_with_parent()
        else:
            target = opts.pk
            return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]

def get_reverse_path_info(self):
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        return [PathInfo(from_opts, opts, (opts.pk,), self, not self.unique, False)]

def get_path_info(self):
        """
        Get path from this field to the related model.
        """
        opts = self.remote_field.model._meta
        from_opts = self.model._meta
        return [PathInfo(from_opts, opts, self.foreign_related_fields, self, False, True)]

def get_reverse_path_info(self):
        """
        Get path from the related model to this field's model.
        """
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        pathinfos = [PathInfo(from_opts, opts, (opts.pk,), self.remote_field, not self.unique, False)]
        return pathinfos

def _get_path_info_with_parent(self):
        """
        Return the path that joins the current model through any parent models.
        The idea is that if you have a GFK defined on a parent model then we
        need to join the parent model first, then the child model.
        """
        # With an inheritance chain ChildTag -> Tag and Tag defines the
        # GenericForeignKey, and a TaggedItem model has a GenericRelation to
        # ChildTag, then we need to generate a join from TaggedItem to Tag
        # (as Tag.object_id == TaggedItem.pk), and another join from Tag to
        # ChildTag (as that is where the relation is to). Do this by first
        # generating a join to the parent model, then generating joins to the
        # child models.
        path = []
        opts = self.remote_field.model._meta
        parent_opts = opts.get_field(self.object_id_field_name).model._meta
        target = parent_opts.pk
        path.append(PathInfo(self.model._meta, parent_opts, (target,), self.remote_field, True, False))
        # Collect joins needed for the parent -> child chain. This is easiest
        # to do if we collect joins for the child -> parent chain and then
        # reverse the direction (call to reverse() and use of
        # field.remote_field.get_path_info()).
        parent_field_chain = []
        while parent_opts != opts:
            field = opts.get_ancestor_link(parent_opts.model)
            parent_field_chain.append(field)
            opts = field.remote_field.model._meta
        parent_field_chain.reverse()
        for field in parent_field_chain:
            path.extend(field.remote_field.get_path_info())
        return path

def get_path_info(self):
        opts = self.remote_field.model._meta
        object_id_field = opts.get_field(self.object_id_field_name)
        if object_id_field.model != opts.model:
            return self._get_path_info_with_parent()
        else:
            target = opts.pk
            return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]

def get_reverse_path_info(self):
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        return [PathInfo(from_opts, opts, (opts.pk,), self, not self.unique, False)]

def _get_path_info_with_parent(self):
        """
        Return the path that joins the current model through any parent models.
        The idea is that if you have a GFK defined on a parent model then we
        need to join the parent model first, then the child model.
        """
        # With an inheritance chain ChildTag -> Tag and Tag defines the
        # GenericForeignKey, and a TaggedItem model has a GenericRelation to
        # ChildTag, then we need to generate a join from TaggedItem to Tag
        # (as Tag.object_id == TaggedItem.pk), and another join from Tag to
        # ChildTag (as that is where the relation is to). Do this by first
        # generating a join to the parent model, then generating joins to the
        # child models.
        path = []
        opts = self.remote_field.model._meta
        parent_opts = opts.get_field(self.object_id_field_name).model._meta
        target = parent_opts.pk
        path.append(PathInfo(self.model._meta, parent_opts, (target,), self.remote_field, True, False))
        # Collect joins needed for the parent -> child chain. This is easiest
        # to do if we collect joins for the child -> parent chain and then
        # reverse the direction (call to reverse() and use of
        # field.remote_field.get_path_info()).
        parent_field_chain = []
        while parent_opts != opts:
            field = opts.get_ancestor_link(parent_opts.model)
            parent_field_chain.append(field)
            opts = field.remote_field.model._meta
        parent_field_chain.reverse()
        for field in parent_field_chain:
            path.extend(field.remote_field.get_path_info())
        return path

def get_path_info(self):
        opts = self.remote_field.model._meta
        object_id_field = opts.get_field(self.object_id_field_name)
        if object_id_field.model != opts.model:
            return self._get_path_info_with_parent()
        else:
            target = opts.pk
            return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]

def get_reverse_path_info(self):
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        return [PathInfo(from_opts, opts, (opts.pk,), self, not self.unique, False)]

def get_path_info(self):
        opts = self.remote_field.model._meta
        target = opts.pk
        return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]

def get_reverse_path_info(self):
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        return [PathInfo(from_opts, opts, (opts.pk,), self, not self.unique, False)]

def _get_path_info_with_parent(self):
        """
        Return the path that joins the current model through any parent models.
        The idea is that if you have a GFK defined on a parent model then we
        need to join the parent model first, then the child model.
        """
        # With an inheritance chain ChildTag -> Tag and Tag defines the
        # GenericForeignKey, and a TaggedItem model has a GenericRelation to
        # ChildTag, then we need to generate a join from TaggedItem to Tag
        # (as Tag.object_id == TaggedItem.pk), and another join from Tag to
        # ChildTag (as that is where the relation is to). Do this by first
        # generating a join to the parent model, then generating joins to the
        # child models.
        path = []
        opts = self.remote_field.model._meta
        parent_opts = opts.get_field(self.object_id_field_name).model._meta
        target = parent_opts.pk
        path.append(PathInfo(self.model._meta, parent_opts, (target,), self.remote_field, True, False))
        # Collect joins needed for the parent -> child chain. This is easiest
        # to do if we collect joins for the child -> parent chain and then
        # reverse the direction (call to reverse() and use of
        # field.remote_field.get_path_info()).
        parent_field_chain = []
        while parent_opts != opts:
            field = opts.get_ancestor_link(parent_opts.model)
            parent_field_chain.append(field)
            opts = field.remote_field.model._meta
        parent_field_chain.reverse()
        for field in parent_field_chain:
            path.extend(field.remote_field.get_path_info())
        return path

def get_path_info(self):
        opts = self.remote_field.model._meta
        object_id_field = opts.get_field(self.object_id_field_name)
        if object_id_field.model != opts.model:
            return self._get_path_info_with_parent()
        else:
            target = opts.pk
            return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]

def get_reverse_path_info(self):
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        return [PathInfo(from_opts, opts, (opts.pk,), self, not self.unique, False)]

def get_path_info(self):
        """
        Get path from this field to the related model.
        """
        opts = self.remote_field.model._meta
        from_opts = self.model._meta
        return [PathInfo(from_opts, opts, self.foreign_related_fields, self, False, True)]

def get_reverse_path_info(self):
        """
        Get path from the related model to this field's model.
        """
        opts = self.model._meta
        from_opts = self.remote_field.model._meta
        pathinfos = [PathInfo(from_opts, opts, (opts.pk,), self.remote_field, not self.unique, False)]
        return pathinfos