Fixed #20000 -- Allowed ModelForm meta overrides for label, help_text and error_messages

docs/ref/forms/models.txt

@@ -5,7 +5,7 @@ Model Form Functions
 .. module:: django.forms.models
    :synopsis: Django's functions for building model forms and formsets.
 
-.. function:: modelform_factory(model, form=ModelForm, fields=None, exclude=None, formfield_callback=None,  widgets=None, localized_fields=None)
+.. function:: modelform_factory(model, form=ModelForm, fields=None, exclude=None, formfield_callback=None, widgets=None, localized_fields=None, labels=None, help_texts=None, error_messages=None)
 
     Returns a :class:`~django.forms.ModelForm` class for the given ``model``.
     You can optionally pass a ``form`` argument to use as a starting point for
@@ -20,11 +20,18 @@ Model Form Functions
 
     ``widgets`` is a dictionary of model field names mapped to a widget.
 
-    ``localized_fields`` is a list of names of fields which should be localized.
-
     ``formfield_callback`` is a callable that takes a model field and returns
     a form field.
 
+    ``localized_fields`` is a list of names of fields which should be localized.
+
+    ``labels`` is a dictionary of model field names mapped to a label.
+
+    ``help_texts`` is a dictionary of model field names mapped to a help text.
+
+    ``error_messages`` is a dictionary of model field names mapped to a
+    dictionary of error messages.
+
     See :ref:`modelforms-factory` for example usage.
 
     .. versionchanged:: 1.6
@@ -35,14 +42,16 @@ Model Form Functions
     information. Omitting any definition of the fields to use will result in all
     fields being used, but this behavior is deprecated.
 
-    The ``localized_fields`` parameter was added.
+    The ``localized_fields``, ``labels``, ``help_texts``, and
+    ``error_messages`` parameters were added.
 
-.. function:: modelformset_factory(model, form=ModelForm, formfield_callback=None, formset=BaseModelFormSet, extra=1, can_delete=False, can_order=False, max_num=None, fields=None, exclude=None, widgets=None, validate_max=False, localized_fields=None)
+.. function:: modelformset_factory(model, form=ModelForm, formfield_callback=None, formset=BaseModelFormSet, extra=1, can_delete=False, can_order=False, max_num=None, fields=None, exclude=None, widgets=None, validate_max=False, localized_fields=None, labels=None, help_texts=None, error_messages=None)
 
     Returns a ``FormSet`` class for the given ``model`` class.
 
     Arguments ``model``, ``form``, ``fields``, ``exclude``,
-    ``formfield_callback``, ``widgets`` and ``localized_fields`` are all passed through to
+    ``formfield_callback``, ``widgets``, ``localized_fields``, ``labels``,
+    ``help_texts``, and ``error_messages`` are all passed through to
     :func:`~django.forms.models.modelform_factory`.
 
     Arguments ``formset``, ``extra``, ``max_num``, ``can_order``,
@@ -54,9 +63,10 @@ Model Form Functions
 
     .. versionchanged:: 1.6
 
-        The ``widgets``, ``validate_max`` and ``localized_fields`` parameters were added.
+        The ``widgets``, ``validate_max``, ``localized_fields``, ``labels``,
+        ``help_texts``, and ``error_messages`` parameters were added.
 
-.. function:: inlineformset_factory(parent_model, model, form=ModelForm, formset=BaseInlineFormSet, fk_name=None, fields=None, exclude=None, extra=3, can_order=False, can_delete=True, max_num=None, formfield_callback=None, widgets=None, validate_max=False, localized_fields=None)
+.. function:: inlineformset_factory(parent_model, model, form=ModelForm, formset=BaseInlineFormSet, fk_name=None, fields=None, exclude=None, extra=3, can_order=False, can_delete=True, max_num=None, formfield_callback=None, widgets=None, validate_max=False, localized_fields=None, labels=None, help_texts=None, error_messages=None)
 
     Returns an ``InlineFormSet`` using :func:`modelformset_factory` with
     defaults of ``formset=BaseInlineFormSet``, ``can_delete=True``, and
@@ -69,4 +79,5 @@ Model Form Functions
 
     .. versionchanged:: 1.6
 
-        The ``widgets``, ``validate_max`` and ``localized_fields`` parameters were added.
+        The ``widgets``, ``validate_max`` and ``localized_fields``, ``labels``,
+        ``help_texts``, and ``error_messages`` parameters were added.

docs/releases/1.6.txt

@@ -236,9 +236,14 @@ Minor features
 .. _`Pillow`: https://pypi.python.org/pypi/Pillow
 .. _`PIL`: https://pypi.python.org/pypi/PIL
 
-* :doc:`ModelForm </topics/forms/modelforms/>` accepts a new
-  Meta option: ``localized_fields``. Fields included in this list will be localized
-  (by setting ``localize`` on the form field).
+* :class:`~django.forms.ModelForm` accepts several new ``Meta``
+  options.
+
+  * Fields included in the ``localized_fields`` list will be localized
+    (by setting ``localize`` on the form field).
+  * The  ``labels``, ``help_texts`` and ``error_messages`` options may be used
+    to customize the default fields, see
+    :ref:`modelforms-overriding-default-fields` for details.
 
 * The ``choices`` argument to model fields now accepts an iterable of iterables
   instead of requiring an iterable of lists or tuples.

docs/topics/forms/modelforms.txt

@@ -141,7 +141,7 @@ In addition, each generated form field has attributes set as follows:
   ``default`` value will be initially selected instead).
 
 Finally, note that you can override the form field used for a given model
-field. See `Overriding the default field types or widgets`_ below.
+field. See `Overriding the default fields`_ below.
 
 A full example
 --------------
@@ -388,8 +388,10 @@ include that field.
 
 .. _section on saving forms: `The save() method`_
 
-Overriding the default field types or widgets
----------------------------------------------
+.. _modelforms-overriding-default-fields:
+
+Overriding the default fields
+-----------------------------
 
 The default field types, as described in the `Field types`_ table above, are
 sensible defaults. If you have a ``DateField`` in your model, chances are you'd
@@ -420,38 +422,65 @@ widget::
 The ``widgets`` dictionary accepts either widget instances (e.g.,
 ``Textarea(...)``) or classes (e.g., ``Textarea``).
 
-If you want to further customize a field -- including its type, label, etc. --
-you can do this by declaratively specifying fields like you would in a regular
-``Form``. Declared fields will override the default ones generated by using the
-``model`` attribute.
+.. versionadded:: 1.6
 
-For example, if you wanted to use ``MyDateFormField`` for the ``pub_date``
+    The ``labels``, ``help_texts`` and ``error_messages`` options were added.
+
+Similarly, you can specify the ``labels``, ``help_texts`` and ``error_messages``
+attributes of the inner ``Meta`` class if you want to further customize a field.
+
+For example if you wanted to customize the wording of all user facing strings for
+the ``name`` field::
+
+    class AuthorForm(ModelForm):
+        class Meta:
+            model = Author
+            fields = ('name', 'title', 'birth_date')
+            labels = {
+                'name': _('Writer'),
+            }
+            help_texts = {
+                'name': _('Some useful help text.'),
+            }
+            error_messages = {
+                'name': {
+                    'max_length': _("This writer's name is too long."),
+                },
+            }
+
+Finally, if you want complete control over of a field -- including its type,
+validators, etc. -- you can do this by declaratively specifying fields like you
+would in a regular ``Form``. Declared fields will override the default ones
+generated by using the ``model`` attribute. Fields declared like this will
+ignore any customizations in the ``widgets``, ``labels``, ``help_texts``, and
+``error_messages`` options declared on ``Meta``.
+
+For example, if you wanted to use ``MySlugFormField`` for the ``slug``
 field, you could do the following::
 
     from django.forms import ModelForm
     from myapp.models import Article
 
     class ArticleForm(ModelForm):
-        pub_date = MyDateFormField()
+        slug = MySlugFormField()
 
         class Meta:
             model = Article
             fields = ['pub_date', 'headline', 'content', 'reporter']
 
 
-If you want to override a field's default label, then specify the ``label``
-parameter when declaring the form field::
+If you want to override a field's default validators, then specify the
+``validators`` parameter when declaring the form field::
 
     from django.forms import ModelForm, DateField
     from myapp.models import Article
 
     class ArticleForm(ModelForm):
-        pub_date = DateField(label='Publication date')
+        slug = CharField(validators=[validate_slug])
 
         class Meta:
             model = Article
-            fields = ['pub_date', 'headline', 'content', 'reporter']
-
+            fields = ['pub_date', 'headline', 'content', 'reporter', 'slug']
 
 .. note::
 
@@ -597,7 +626,7 @@ example by specifying the widgets to be used for a given field::
 
     >>> from django.forms import Textarea
     >>> Form = modelform_factory(Book, form=BookForm,
-                                 widgets={"title": Textarea()})
+    ...                          widgets={"title": Textarea()})
 
 The fields to include can be specified using the ``fields`` and ``exclude``
 keyword arguments, or the corresponding attributes on the ``ModelForm`` inner