The Provides system¶

The Provides system is Shuup’s mechanism for discovering and loading components, both first-party and third-party. Shuup apps use the provides system in various ways.

The core itself uses Provides for discovering method and supplier modules.
shuup.admin uses Provides to load admin modules, form customizations etc.
shuup.front uses it for URLconf overrides etc.

The provide categories used by Shuup are listed in Provide Categories but you can also define your own categories as you wish.

Todo

Document the various ways better.

Provides are grouped under different categories, such as admin_module, xtheme_plugin, front_urls, etc.

Declaring Provides¶

Shuup uses the Django 1.7+ AppConfig system to declare provides.

Quite simply, a developer needs only include a dict with provide categories as the keys and lists of loading specs as values for new provides to be discovered.

class PigeonAppConfig(AppConfig):

    provides = {
        'service_provider_admin_form': [
            'pigeon.admin_forms:PigeonShippingAdminForm',
        ],
    }

Note

Some provides also require the class named by the spec string to include an identifier field. Refer to the implementation guides for particular functionalities for details.

Using Provides¶

Provide management functions are found in the shuup.apps.provides module.

In general, the shuup.apps.provides.get_provide_objects method is your most useful entry point.

Provide Categories¶

Core¶

admin_category_form_part: Additional FormPart classes for Category editing. See example.
admin_contact_form_part: Additional FormPart classes for Contact editing. See example.
admin_contact_group_form_part: Additional FormPart classes for ContactGroup editing. See example.
admin_contact_toolbar_action_item: Additional DropdownItem subclass for Contact detail action buttons.
admin_contact_edit_toolbar_button: Additional BaseActionButton subclasses for Contact edit. Subclass init should take current contact as a parameter.
admin_contact_section: Additional Section subclasses for Contact detail sections.
admin_extend_create_shipment_form: Allows providing extension for shipment creation in admin. Should implement the FormModifier interface.
admin_extend_attribute_form: Allows providing extension for the product attribute form in admin. Should implement the FormModifier interface.
admin_order_information: Additional information rows for Order detail page. Provide objects should inherit from OrderInformation class.
admin_main_menu_updater: Allows updating the Admin Main Menu with new elements. The objects offered through this provide should inherit from ~shuup.core.utils.menu.MainMenuUpdater class.
admin_product_form_part: Additional FormPart classes for Product editing. (This is used by pricing modules, for instance.) See example.
admin_product_section: Additional Section subclasses for Product edit sections.
admin_product_toolbar_action_item: Additional DropdownItem subclass for Product edit action buttons.
admin_shop_form_part: Additional FormPart classes for Shop editing. See example.
admin_module: Admin module classes. Practically all of the functionality in the admin is built via admin modules.
customer_dashboard_items: Classes to parse customer dashboard items from. These are subclasses of shuup.front.utils.dashboard.DashboardItem
discount_module: DiscountModule for pricing system.
front_extend_product_list_form: Allows providing extension for product list form. Should implement the ProductListFormModifier interface.
front_service_checkout_phase_provider: Allows providing a custom checkout phase for a service (e.g. payment method or shipping method). Should implement the ServiceCheckoutPhaseProvider interface.
front_template_helper_namespace: Additional namespaces to install in the shuup “package” within template contexts. .. seealso:: Custom Template Helper Functions
admin_order_toolbar_action_item: Additional DropdownItem subclass for Order detail action buttons. Current order is passed to subclass init and static method visible_for_object is called for the subclass to check whether to actually show the item.
admin_order_section: Additional Section subclasses for Order detail sections.
front_menu_extender: Additional menu items provided by addons. These should be subclassed from FrontMenuExtender.
front_product_order_form: List of order forms which are subclasses of ProductOrderForm. These forms are shown on product detail page in front as well as previews etc.
front_urls: Lists of frontend URLs to be appended to the usual frontend URLs.
front_urls_post: Lists of frontend URLs to be appended to the usual frontend URLs, even after front_urls. Most of the time, front_urls should do.
front_urls_pre: Lists of frontend URLs to be prepended to the usual frontend URLs. Most of the time, front_urls should do.
notify_action: Notification framework Action classes.
notify_condition: Notification framework Condition classes.
notify_event: Notification framework Event classes.
notify_script_template: Notification framework ScriptTemplate classes.
order_printouts_delivery_extra_fields: Additional information rows for order delivery printout. Provide objects should inherit from PrintoutDeliveryExtraInformation class.
order_source_modifier_module: OrderSourceModifierModule for modifying order source, e.g. in its get_final_lines.
pricing_module: Pricing module classes; the pricing module in use is set with the SHUUP_PRICING_MODULE setting.
service_behavior_component_form: Forms for creating service behavior components in Shop Admin. When creating a custom service behavior component, provide a form for it via this provide.
service_provider_admin_form: Forms for creating service providers in Shop Admin. When creating a custom service provider (e.g. carrier or payment processor), provide a form for it via this provide.
carrier_wizard_form_def: Formdefs for creating carriers (and their service(s)) through the shop setup wizard.
payment_processor_wizard_form_def: Formdefs for creating payment processors (and their service(s)) through the shop setup wizard.
product_context_extra: Additional context data for the front product views. Provide objects should inherit from ProductContextExtra class.
supplier_module: Supplier module classes (deriving from BaseSupplierModule), as used by Supplier.
tax_module: Tax module classes; the tax module in use is set with the SHUUP_TAX_MODULE setting.
xtheme: XTheme themes (full theme sets).
xtheme_plugin: XTheme plugins (that are placed into placeholders within themes).
xtheme_resource_injection: XTheme resources injection function that takes current context and content as parameters.

Campaigns Provide Categories¶

campaign_catalog_filter: Filters that filter product catalog queryset to find the matching campaigns.
campaign_context_condition: Context Conditions that matches against the current context in shop to see if campaign matches.
campaign_product_discount_effect_form: Form for handling product discount effects of a catalog campaign. Should be a ModelForm with its model being a subclass of ProductDiscountEffect.
campaign_basket_condition: Conditions that matches against the order source or source lines in basket.
campaign_basket_discount_effect_form: Form for handling discount effects of a basket campaign. Should be a ModelForm with its model being a subclass of BasketDiscountEffect.
campaign_basket_line_effect_form: Form for handling line effects of a basket campaign. Should be a ModelForm with its model being a subclass of BasketLineEffect.

Reports Provide Categories¶

reports: Class to handle report data collection. Should be a subclass of ShuupReportBase.
report_writer_populator: List of functions to populate report writers. This allows the creation of custom output formats. Should follow the signature of populate_default_writers.