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Fixed #3334 -- Changed newforms Form class construction so that appen…

…ding to (or altering) self.fields affects only the instance, not the class. As a consequence, self.fields is created in Form.__init__(). The form metaclass now creates a variable self.base_fields instead of self.fields.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4437 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit c93686c6987df97880cb0edc5535c6d5cbec9e6d 1 parent c0e0141
Adrian Holovaty adrianholovaty authored
13 django/newforms/forms.py
View
@@ -26,12 +26,15 @@ def __init__(self, data=None):
self.keyOrder = [d[0] for d in data]
dict.__init__(self, dict(data))
+ def copy(self):
+ return SortedDictFromList(self.items())
+
class DeclarativeFieldsMetaclass(type):
- "Metaclass that converts Field attributes to a dictionary called 'fields'."
+ "Metaclass that converts Field attributes to a dictionary called 'base_fields'."
def __new__(cls, name, bases, attrs):
fields = [(field_name, attrs.pop(field_name)) for field_name, obj in attrs.items() if isinstance(obj, Field)]
fields.sort(lambda x, y: cmp(x[1].creation_counter, y[1].creation_counter))
- attrs['fields'] = SortedDictFromList(fields)
+ attrs['base_fields'] = SortedDictFromList(fields)
return type.__new__(cls, name, bases, attrs)
class BaseForm(StrAndUnicode):
@@ -46,6 +49,12 @@ def __init__(self, data=None, auto_id='id_%s', prefix=None, initial=None):
self.prefix = prefix
self.initial = initial or {}
self.__errors = None # Stores the errors after clean() has been called.
+ # The base_fields class attribute is the *class-wide* definition of
+ # fields. Because a particular *instance* of the class might want to
+ # alter self.fields, we create self.fields here by copying base_fields.
+ # Instances should always modify self.fields; they should not modify
+ # self.base_fields.
+ self.fields = self.base_fields.copy()
def __unicode__(self):
return self.as_table()
6 django/newforms/models.py
View
@@ -64,7 +64,7 @@ def form_for_model(model, form=BaseForm, formfield_callback=lambda f: f.formfiel
if formfield:
field_list.append((f.name, formfield))
fields = SortedDictFromList(field_list)
- return type(opts.object_name + 'Form', (form,), {'fields': fields, '_model': model, 'save': model_save})
+ return type(opts.object_name + 'Form', (form,), {'base_fields': fields, '_model': model, 'save': model_save})
def form_for_instance(instance, form=BaseForm, formfield_callback=lambda f, **kwargs: f.formfield(**kwargs)):
"""
@@ -87,9 +87,9 @@ def form_for_instance(instance, form=BaseForm, formfield_callback=lambda f, **kw
field_list.append((f.name, formfield))
fields = SortedDictFromList(field_list)
return type(opts.object_name + 'InstanceForm', (form,),
- {'fields': fields, '_model': model, 'save': make_instance_save(instance)})
+ {'base_fields': fields, '_model': model, 'save': make_instance_save(instance)})
def form_for_fields(field_list):
"Returns a Form class for the given list of Django database field instances."
fields = SortedDictFromList([(f.name, f.formfield()) for f in field_list])
- return type('FormForFields', (BaseForm,), {'fields': fields})
+ return type('FormForFields', (BaseForm,), {'base_fields': fields})
20 tests/regressiontests/forms/tests.py
View
@@ -2277,6 +2277,8 @@
>>> f.clean_data
{'username': u'adrian', 'password1': u'foo', 'password2': u'foo'}
+# Dynamic construction ########################################################
+
It's possible to construct a Form dynamically by adding to the self.fields
dictionary in __init__(). Don't forget to call Form.__init__() within the
subclass' __init__().
@@ -2292,6 +2294,24 @@
<tr><th>Last name:</th><td><input type="text" name="last_name" /></td></tr>
<tr><th>Birthday:</th><td><input type="text" name="birthday" /></td></tr>
+Instances of a dynamic Form do not persist fields from one Form instance to
+the next.
+>>> class MyForm(Form):
+... def __init__(self, data=None, auto_id=False, field_list=[]):
+... Form.__init__(self, data, auto_id)
+... for field in field_list:
+... self.fields[field[0]] = field[1]
+>>> field_list = [('field1', CharField()), ('field2', CharField())]
+>>> my_form = MyForm(field_list=field_list)
+>>> print my_form
+<tr><th>Field1:</th><td><input type="text" name="field1" /></td></tr>
+<tr><th>Field2:</th><td><input type="text" name="field2" /></td></tr>
+>>> field_list = [('field3', CharField()), ('field4', CharField())]
+>>> my_form = MyForm(field_list=field_list)
+>>> print my_form
+<tr><th>Field3:</th><td><input type="text" name="field3" /></td></tr>
+<tr><th>Field4:</th><td><input type="text" name="field4" /></td></tr>
+
HiddenInput widgets are displayed differently in the as_table(), as_ul()
and as_p() output of a Form -- their verbose names are not displayed, and a
separate row is not displayed. They're displayed in the last row of the
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