Remove the detail=None from APIException signature

The documentation not match with the implementation. The APIException doesn't have detail parameter in the constructor class, actually doesn't have constructor method at all.

Mention name of file to edit

Using the filenames where relevant

Added name of file to edit

add @tamakisquare for work on #1111

fix writing into foreign key with non-null source

Test case and fix for issue 1111

Return object in save_object

Fixed #1179: RepresenterError with DecimalField and YAMLRenderer

Put template block around the description

Sometimes it's hard to tell which file the code is intended to go in. Now it spells it out.

To reduce unnecessary cognitive load of the learner, name the file they are putting this code in.

So reader doesn't have to remember, or check through all the files to find where this code fragment was, mention the file name when it is relevant.

The error occurs when serializer is set with partial=True and a
field-level validation is defined on a field, for which there's no
corresponding update value in .data

Add missing commas in relations.md

Be sure to import UserSerializer

Feature: add transform_<fieldname> methods to serializers

typo fix

support args on get_object_or_404