What is `related_name` used for in Django?

Question

What is the related_name argument useful for on ManyToManyField and ForeignKey fields? For example, given the following code, what is

Answer 1

The related name parameter is actually an option. If we do not set it, Django automatically creates the other side of the relation for us. In the case of the Map model, Django would have created a map_set attribute, allowing access via m.map_set in your example(m being your class instance). The formula Django uses is the name of the model followed by the string _set. The related name parameter thus simply overrides Django’s default rather than providing new behavior.