How To Bind A Field In __init__ Function Of A Form
class Example_Form(Form): field_1 = TextAreaField() field_2 = TextAreaField() def __init__(self, type, **kwargs): super(Example_Form, self).__init__(**kwargs)
Solution 1:
Use self.meta.bind_field
to create a bound field, and assign it to the instance and the _fields
dict.
self.field_3 = self._fields['field_3'] = self.meta.bind_field(
self, TextAreaField(),
{'name': 'field_3', 'prefix': self._prefix}
)
In most cases, it's more clear to use a subclass and decide which class to use when creating the form instance.
class F1(Form):
x = StringField()
class F2(F1):
y = StringField()
form = F1() if type == 1 else F2()
If you need to be more dynamic, you can subclass the form and assign fields to it. Assigning fields to classes works directly, unlike with instances.
class F3(F1):
pass
if type == 3:
F3.z = StringField()
form = F3()
You can also define all fields, then choose to delete some before validating the form.
class F(Form):
x = StringField()
y = StringField()
form = F()
if type == 1:
del form.y
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