Module reverse_related
 "Rel objects" for related fields. 
"Rel objects" (for lack of a better name) carry information about the relation
modeled by a related field and provide some utility functions. They're stored
in the ``remote_field`` attribute of the field.
They also act as reverse fields for the purposes of the Meta API because
they're the closest concept currently available.
source linkClasses
-  
 Used by ForeignObject to store information about the relation. 
 -  
 Used by ManyToManyField to store information about the relation. 
 -  
 Used by the ForeignKey field to store information about the relation. 
 -  
 Used by OneToOneField to store information about the relation.