      Traceback (most recent call last):
      ...
      FieldError: Non-relational field given in select_related: 'title'
  
  But it didn't prohibit nested non-relation fields as it does now::
  
      >>> Book.objects.select_related('author__name')
      Traceback (most recent call last):
      ...
      FieldError: Non-relational field given in select_related: 'name'
 
</s> remove Django 1.8 added validation for non-relational fields in ``select_related()``::
 </s> add Django 1.8 added validation for non-relational fields in ``select_related()``:

.. code-block:: pycon </s> remove     >>> mapping = {'name' : 'str', # The 'name' model field maps to the 'str' layer field.
                   'poly' : 'POLYGON', # For geometry fields use OGC name.
                   } # The mapping is a dictionary
 </s> add     >>> mapping = {
    ...     'name': 'str', # The 'name' model field maps to the 'str' layer field.
    ...     'poly': 'POLYGON', # For geometry fields use OGC name.
    ... } # The mapping is a dictionary </s> remove like so::
 </s> add like so:

.. code-block:: pycon </s> remove         DATUM["WGS_1984",
             SPHEROID["WGS 84",6378137,298.257223563,
                 AUTHORITY["EPSG","7030"]],
             AUTHORITY["EPSG","6326"]],
         PRIMEM["Greenwich",0,
             AUTHORITY["EPSG","8901"]],
         UNIT["degree",0.01745329251994328,
             AUTHORITY["EPSG","9122"]],
         AUTHORITY["EPSG","4326"]]""") # OGC WKT
 </s> add         ... DATUM["WGS_1984",
        ...      SPHEROID["WGS 84",6378137,298.257223563,
        ...          AUTHORITY["EPSG","7030"]],
        ...      AUTHORITY["EPSG","6326"]],
        ... PRIMEM["Greenwich",0,
        ...      AUTHORITY["EPSG","8901"]],
        ... UNIT["degree",0.01745329251994328,
        ...      AUTHORITY["EPSG","9122"]],
        ... AUTHORITY["EPSG","4326"]]""") # OGC WKT
But it didn't prohibit nested non-relation fields as it does now:

.. code-block:: pycon
      Traceback (most recent call last):
      ...
      FieldError: Non-relational field given in select_related: 'title'
  
But it didn't prohibit nested non-relation fields as it does now:

.. code-block:: pycon
  
      >>> Book.objects.select_related('author__name')
      Traceback (most recent call last):
      ...
      FieldError: Non-relational field given in select_related: 'name'
keep keep keep keep replace keep keep keep keep keep
 Refs #34140 -- Corrected rst code-block and various formatting issues in docs. 
docs/releases/1.10.txt