Form

Base class: Part

Describe a Form. Example:

class MyForm(Form):
    a = Field()
    b = Field.email()

form = MyForm().bind(request=request)

You can also create an instance of a form with this syntax if it’s more convenient:

form = Form(
    fields=dict(
        a=Field(),
        b=Field.email(),
    ),
).bind(request=request)

See tri.declarative docs for more on this dual style of declaration.

In the common case the fields namespace will contain only instances of Field, but iommi actually supports arbitrary Part objects. For example:

form = Form(
    fields=dict(
        # Display a and b inside a box
        box=html.div(
            attrs__class__box=True,
            children__a=Field(),
            children__b=Field.email(),
        ),
        # And c regularly
        c=Field(),
    )
)

So that writing the application logic (e.g. validation and post handlers) is independent of minor changes to the layout, after bind the fields namespace of the form will contain only instances of Field keyed by their _name independently of how deep they are in the hierarchy. Given the above, an appropriate post_handler would be:

def post_handler(form, **_):
    if not form.is_valid():
        return

    print(form.fields.a.value, form.fields.b.value, form.fields.c.value)
    # And not:
    # print(form.fields.box.a.value, form.fields.box.b.value, form.fields.c.value)

Refinable members

• action_class

  Type: Type[iommi.action.Action]

• actions

  Type: Namespace

• actions_template

  Type: Union[str, iommi._web_compat.Template]

• after

  Type: Union[int, str]

• assets

  Type: Namespace

• attr

  Type: str

• attrs

  Type: Attrs

• auto

  Type: Namespace

• editable

  Type: bool

  Default: True

• endpoints

  Type: Namespace

• errors

  Type: Errors

• extra

  Type: Dict[str, Any]

• extra_evaluated

  Type: Dict[str, Any]

• field_group

  Type: Namespace

• fields

  Type: Namespace

• h_tag

  Type: Union[iommi.fragment.Fragment, str]

• include

  Type: bool

• instance

  Type: Any

• iommi_style

  Type: str

• member_class

  Type: Type[iommi.form.Field]

• model

  Type: Type[django.db.models.base.Model]

• page_class

  Type: Type[iommi.page.Page]

• post_validation

• read_nested_form_from_instance

• template

  Type: Union[str, iommi._web_compat.Template]

• title

  Type: Fragment

• write_nested_form_to_instance

Shortcuts

create

Defaults

• extra__is_create

  • True

• extra__new_instance

  • lambda form, **_: form.model()

• extra__crud_type

  • create

• actions__submit__post_handler

  • iommi.form.create_object__post_handler

crud

Defaults

• extra__pre_save_all_but_related_fields

  • lambda **kwargs: None, # pragma: no mutate

• extra__on_save_all_but_related_fields

  • lambda **kwargs: None, # pragma: no mutate

• extra__pre_save

  • lambda **kwargs: None, # pragma: no mutate

• extra__on_save

  • lambda **kwargs: None, # pragma: no mutate

• extra__on_delete

  • lambda **kwargs: None, # pragma: no mutate

• extra__redirect

  • lambda redirect_to, **_: HttpResponseRedirect(redirect_to)

• extra__redirect_to

  • None

• auto

  • Namespace()

delete

Defaults

• actions__submit__call_target__attribute

  • delete

• actions__submit__post_handler

  • iommi.form.delete_object__post_handler

• extra__crud_type

  • delete

• editable

  • False

edit

Defaults

• extra__is_create

  • False

• extra__crud_type

  • edit

• actions__submit__post_handler

  • iommi.form.edit_object__post_handler