Remove the two most irritating style warnings that I keep banging my head against.

In dynamic usage with moderately complex serializer hierarchy, these are a real PITA.

* Why should I specify a queryset= kwarg on my RelatedField subclass when I have a get_queryset() method?
* When source=dynamic_thing(), don't make me check if it's equal to the field_name. Who cares? This also prevents calling bind() twice.

rest_framework/fields.py

@@ -322,16 +322,6 @@ class Field(object):
         Called when a field is added to the parent serializer instance.
         """
 
-        # In order to enforce a consistent style, we error if a redundant
-        # 'source' argument has been used. For example:
-        # my_field = serializer.CharField(source='my_field')
-        assert self.source != field_name, (
-            "It is redundant to specify `source='%s'` on field '%s' in "
-            "serializer '%s', because it is the same as the field name. "
-            "Remove the `source` keyword argument." %
-            (field_name, self.__class__.__name__, parent.__class__.__name__)
-        )
-
         self.field_name = field_name
         self.parent = parent
 

rest_framework/relations.py

@@ -65,10 +65,6 @@ class RelatedField(Field):
         self.queryset = kwargs.pop('queryset', self.queryset)
         self.html_cutoff = kwargs.pop('html_cutoff', self.html_cutoff)
         self.html_cutoff_text = kwargs.pop('html_cutoff_text', self.html_cutoff_text)
-        assert self.queryset is not None or kwargs.get('read_only', None), (
-            'Relational field must provide a `queryset` argument, '
-            'or set read_only=`True`.'
-        )
         kwargs.pop('many', None)
         kwargs.pop('allow_empty', None)
         super(RelatedField, self).__init__(**kwargs)