dal: django-autocomplete-light3 API

Views

Base views for autocomplete widgets.

class dal.views.BaseQuerySetView(**kwargs)

Base view to get results from a QuerySet.

create_field

Name of the field to use to create missing values. For example, if create_field=’title’, and the user types in “foo”, then the autocomplete view will propose an option ‘Create “foo”’ if it can’t find any value matching “foo”. When the user does click ‘Create “foo”’, the autocomplete script should POST to this view to create the object and get back the newly created object id.

create_object(text)

Create an object given a text.

get_queryset()

Filter the queryset with GET[‘q’].

get_result_label(result)

Return the label of a result.

get_result_value(result)

Return the value of a result.

has_add_permission(request)

Return True if the user has the permission to add a model.

has_more(context)

For widgets that have infinite-scroll feature.

post(request)

Create an object given a text after checking permissions.

class dal.views.ViewMixin

Common methods for autocomplete views.

forwarded

Dict of field values that were forwarded from the form, may be used to filter autocompletion results based on the form state. See linked_data example for reference.

q

Query string as typed by the user in the autocomplete field.

dispatch(request, *args, **kwargs)

Set forwarded and q.

Widgets

Autocomplete widgets bases.

class dal.widgets.QuerySetSelectMixin(url=None, forward=None, *args, **kwargs)

QuerySet support for choices.

filter_choices_to_render(selected_choices)

Filter out un-selected choices if choices is a QuerySet.

class dal.widgets.Select(url=None, forward=None, *args, **kwargs)

Replacement for Django’s Select to render only selected choices.

class dal.widgets.SelectMultiple(url=None, forward=None, *args, **kwargs)

Replacement SelectMultiple to render only selected choices.

class dal.widgets.WidgetMixin(url=None, forward=None, *args, **kwargs)

Base mixin for autocomplete widgets.

url

Absolute URL to the autocomplete view for the widget. It can be set to a a URL name, in which case it will be reversed when the attribute is accessed.

forward

List of field names to forward to the autocomplete view, useful to filter results using values of other fields in the form.

build_attrs(*args, **kwargs)

Build HTML attributes for the widget.

filter_choices_to_render(selected_choices)

Replace self.choices with selected_choices.

render_options(*args)

Django-compatibility method for option rendering.

Should only render selected options, by setting self.choices before calling the parent method.

Fields

FutureModelForm

tl;dr: See FutureModelForm’s docstring.

Many apps provide new related managers to extend your django models with. For example, django-tagulous provides a TagField which abstracts an M2M relation with the Tag model, django-gm2m provides a GM2MField which abstracts an relation, django-taggit provides a TaggableManager which abstracts a relation too, django-generic-m2m provides RelatedObjectsDescriptor which abstracts a relation again.

While that works pretty well, it gets a bit complicated when it comes to encapsulating the business logic for saving such data in a form object. This is three-part problem:

• getting initial data,
• saving instance attributes,
• saving relations like reverse relations or many to many.

Django’s ModelForm calls the form field’s value_from_object() method to get the initial data. FutureModelForm tries the value_from_object() method from the form field instead, if defined. Unlike the model field, the form field doesn’t know its name, so FutureModelForm passes it when calling the form field’s value_from_object() method.

Django’s ModelForm calls the form field’s save_form_data() in two occasions:

• in _post_clean() for model fields in Meta.fields,
• in _save_m2m() for model fields in Meta.virtual_fields and Meta.many_to_many, which then operate on an instance which as a PK.

If we just added save_form_data() to form fields like for value_from_object() then it would be called twice, once in _post_clean() and once in _save_m2m(). Instead, FutureModelForm would call the following methods from the form field, if defined:

• save_object_data() in _post_clean(), to set object attributes for a given value,
• save_relation_data() in _save_m2m(), to save relations for a given value.

For example:

• a generic foreign key only sets instance attributes, its form field would do that in save_object_data(),
• a tag field saves relations, its form field would do that in save_relation_data().

class dal.forms.FutureModelForm(*args, **kwargs)

ModelForm which adds extra API to form fields.

Form fields may define new methods for FutureModelForm:

• FormField.value_from_object(instance, name) should return the initial value to use in the form, overrides ModelField.value_from_object() which is what ModelForm uses by default,
• FormField.save_object_data(instance, name, value) should set instance attributes. Called by save() before writting the database, when instance.pk may not be set, it overrides ModelField.save_form_data() which is normally used in this occasion for non-m2m and non-virtual model fields.
• FormField.save_relation_data(instance, name, value) should save relations required for value on the instance. Called by save() after writting the database, when instance.pk is necessarely set, it overrides ModelField.save_form_data() which is normally used in this occasion for m2m and virtual model fields.

For complete rationale, see this module’s docstring.

save(commit=True)

Backport from Django 1.9+ for 1.8.

dal_select2: Select2 support for DAL

This is a front-end module: it provides views and widgets.

Views

Select2 view implementation.

class dal_select2.views.Select2QuerySetView(**kwargs)

List options for a Select2 widget.

class dal_select2.views.Select2ViewMixin

View mixin to render a JSON response for Select2.

get_results(context)

Return data for the ‘results’ key of the response.

render_to_response(context)

Return a JSON response in Select2 format.

Widgets

Select2 widget implementation module.

class dal_select2.widgets.ModelSelect2(url=None, forward=None, *args, **kwargs)

Select widget for QuerySet choices and Select2.

class dal_select2.widgets.ModelSelect2Multiple(url=None, forward=None, *args, **kwargs)

SelectMultiple widget for QuerySet choices and Select2.

class dal_select2.widgets.Select2WidgetMixin

Mixin for Select2 widgets.

class Media

Automatically include static files for the admin.

class dal_select2.widgets.TagSelect2(url=None, forward=None, *args, **kwargs)

Select2 in tag mode.

build_attrs(*args, **kwargs)

Automatically set data-tags=1.

value_from_datadict(data, files, name)

Return a comma-separated list of options.

This is needed because Select2 uses a multiple select even in tag mode, and the model field expects a comma-separated list of tags.

Test tools

Helpers for DAL user story based tests.

class dal_select2.test.Select2Story

Define Select2 CSS selectors.

dal_contenttypes: GenericForeignKey support

Fields

Model choice fields that take a ContentType too: for generic relations.

class dal_contenttypes.fields.ContentTypeModelFieldMixin

Common methods for form fields for GenericForeignKey.

ModelChoiceFieldMixin expects options to look like:

<option value="4">Model #4</option>

With a ContentType of id 3 for that model, it becomes:

<option value="3-4">Model #4</option>

prepare_value(value)

Return a ctypeid-objpk string for value.

class dal_contenttypes.fields.ContentTypeModelMultipleFieldMixin

Same as ContentTypeModelFieldMixin, but supports value list.

prepare_value(value)

Run the parent’s method for each value.

class dal_contenttypes.fields.GenericModelMixin

GenericForeignKey support for form fields, with FutureModelForm.

GenericForeignKey enforce editable=false, this class implements save_object_data() and value_from_object() to allow FutureModelForm to compensate.

save_object_data(instance, name, value)

Set the attribute, for FutureModelForm.

value_from_object(instance, name)

Get the attribute, for FutureModelForm.

dal_select2_queryset_sequence: Select2 for QuerySetSequence choices

Views

View for a Select2 widget and QuerySetSequence-based business logic.

class dal_select2_queryset_sequence.views.Select2QuerySetSequenceView(**kwargs)

Combines support QuerySetSequence and Select2 in a single view.

Example usage:

url(
    '^your-generic-autocomplete/$',
    autocomplete.Select2QuerySetSequenceView.as_view(
        queryset=autocomplete.QuerySetSequence(
            Group.objects.all(),
            TestModel.objects.all(),
        )
    ),
    name='your-generic-autocomplete',
)

It is compatible with the widgets and the fields of dal_contenttypes, suits generic relation autocompletes.

get_results(context)

Return a list of results usable by Select2.

It will render as a list of one <optgroup> per different content type containing a list of one <option> per model.

Wigets

Widgets for Select2 and QuerySetSequence.

They combine Select2WidgetMixin and QuerySetSequenceSelectMixin with Django’s Select and SelectMultiple widgets, and are meant to be used with generic model form fields such as those in dal_contenttypes.

class dal_select2_queryset_sequence.widgets.QuerySetSequenceSelect2(url=None, forward=None, *args, **kwargs)

Single model select for a generic select2 autocomplete.

class dal_select2_queryset_sequence.widgets.QuerySetSequenceSelect2Multiple(url=None, forward=None, *args, **kwargs)

Multiple model select for a generic select2 autocomplete.

dal_queryset_sequence: QuerySetSequence choices

Views

View that supports QuerySetSequence.

class dal_queryset_sequence.views.BaseQuerySetSequenceView(**kwargs)

Base view that uses a QuerySetSequence.

Compatible with form fields which use a ContentType id as well as a model pk to identify a value.

get_paginate_by(queryset)

Don’t paginate if mixup.

get_queryset()

Mix results from all querysets in QuerySetSequence if self.mixup.

get_result_value(result)

Return ctypeid-objectid for result.

has_more(context)

Return False if mixup.

mixup_querysets(qs)

Return a queryset with different model types.

Fields

Autocomplete fields for QuerySetSequence choices.

class dal_queryset_sequence.fields.QuerySetSequenceFieldMixin

Base methods for QuerySetSequence fields.

get_content_type_id_object_id(value)

Return a tuple of ctype id, object id for value.

get_queryset_for_content_type(content_type_id)

Return the QuerySet from the QuerySetSequence for a ctype.

raise_invalid_choice(params=None)

Raise a ValidationError for invalid_choice.

The validation error left unprecise about the exact error for security reasons, to prevent an attacker doing information gathering to reverse valid content type and object ids.

class dal_queryset_sequence.fields.QuerySetSequenceModelField(queryset, empty_label=u'---------', required=True, widget=None, label=None, initial=None, help_text=u'', to_field_name=None, limit_choices_to=None, *args, **kwargs)

Replacement for ModelChoiceField supporting QuerySetSequence choices.

to_python(value)

Given a string like ‘3-5’, return the model of ctype #3 and pk 5.

Note that in the case of ModelChoiceField, to_python is also in charge of security, it’s important to get the results from self.queryset.

class dal_queryset_sequence.fields.QuerySetSequenceModelMultipleField(queryset, required=True, widget=None, label=None, initial=None, help_text=u'', *args, **kwargs)

ModelMultipleChoiceField with support for QuerySetSequence choices.

Widgets

Widget mixin that only renders selected options with QuerySetSequence.

For details about why this is required, see dal.widgets.

class dal_queryset_sequence.widgets.QuerySetSequenceSelect(url=None, forward=None, *args, **kwargs)

Select widget for QuerySetSequence choices.

class dal_queryset_sequence.widgets.QuerySetSequenceSelectMixin(url=None, forward=None, *args, **kwargs)

Support QuerySetSequence in WidgetMixin.

filter_choices_to_render(selected_choices)

Overwrite self.choices to exclude unselected values.

class dal_queryset_sequence.widgets.QuerySetSequenceSelectMultiple(url=None, forward=None, *args, **kwargs)

SelectMultiple widget for QuerySetSequence choices.

dal_gm2m_queryset_sequence

Fields

Form fields for using django-gm2m with QuerySetSequence.

class dal_gm2m_queryset_sequence.fields.GM2MQuerySetSequenceField(queryset, required=True, widget=None, label=None, initial=None, help_text=u'', *args, **kwargs)

Form field for QuerySetSequence to django-generic-m2m relation.

dal_genericm2m_queryset_sequence

Fields

Autocomplete fields for django-queryset-sequence and django-generic-m2m.

class dal_genericm2m_queryset_sequence.fields.GenericM2MQuerySetSequenceField(queryset, required=True, widget=None, label=None, initial=None, help_text=u'', *args, **kwargs)

Autocomplete field for GM2MField() for QuerySetSequence choices.

dal_gm2m: django-gm2m support

Fields

GM2MField support for autocomplete fields.

class dal_gm2m.fields.GM2MFieldMixin

GM2MField ror FutureModelForm.

save_relation_data(instance, name, value)

Save the relation into the GM2MField.

value_from_object(instance, name)

Return the list of objects in the GM2MField relation.

dal_genericm2m: django-genericm2m support

Fields

django-generic-m2m field mixin for FutureModelForm.

class dal_genericm2m.fields.GenericM2MFieldMixin

Form field mixin able to get / set instance generic-m2m relations.

save_relation_data(instance, name, value)

Update the relation to be value.

value_from_object(instance, name)

Return the list of related objects.

dal_select2_taggit: django-taggit support

Fields

Widgets for Select2 and django-taggit.

class dal_select2_taggit.widgets.TaggitSelect2(url=None, forward=None, *args, **kwargs)

Select2 tag widget for taggit’s TagField.

render_options(*args)

Render only selected tags.

dal_select2_tagging: django-tagging support

Fields

Widgets for Select2 and django-taggit.

class dal_select2_tagging.widgets.TaggingSelect2(url=None, forward=None, *args, **kwargs)

Select2 tag widget for tagging’s TagField.

render_options(*args)

Render only selected tags.