Auto-generate CRUD forms for a given domain class.

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Introduction

Scaffolding allows you to auto-generate forms for models. The goal is to create commonly used forms without much boilerplate while still allowing for deeper customizations.

Before we can start using scaffolding, we must create the content to work with:

Models

>>> import grokcore.component as grok
>>> from zope.interface import Interface
>>> from zope import schema

>>> class IMammoth(Interface):
...    name = schema.TextLine(title=u"Name")
...    age = schema.Int(title=u"Age")

>>> class Mammoth(Model):
...    grok.implements(IMammoth)
...    name = schema.fieldproperty.FieldProperty(IMammoth['name'])
...    age = schema.fieldproperty.FieldProperty(IMammoth['age'])

>>> class HerdContainer(Container):
...    pass

Now all we have to do is create a controller:

Whole application in a few lines

>>> from megrok.scaffold import Controller, scaffold

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth)

That’s it. And we have an add form, an edit form, display ‘form’ and a list view. With deletion enabled.

Let’s verify that.

Grokking and querying

We let Grok register the component:

>>> grok_component('mammothcontroller', MammothController)
True

Now, we can query it normally:

>>> from zope.publisher.browser import TestRequest
>>> request = TestRequest()
>>> herd = HerdContainer()
>>> getRootFolder()['herd'] = herd
>>> manfred = Mammoth()
>>> herd['manfred'] = manfred

>>> from zope.component import getMultiAdapter
>>> editform = getMultiAdapter((manfred, request), name="edit")

>>> editform
<EditForm 'edit'>
>>> print editform()
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<div id="edit-mammoth" class="scaffold-edit">
<form action="http://127.0.0.1" method="post"
    class="edit-form" enctype="multipart/form-data">
...

>>> displayform = getMultiAdapter((manfred, request), name="index")
>>> displayform
<DisplayForm 'index'>

>>> addform = getMultiAdapter((herd, request), name="addmammoth")
>>> addform
<AddForm 'addmammoth'>

>>> listform = getMultiAdapter((herd, request), name="listmammoth")
>>> listform
<ListForm 'listmammoth'>

Layout integration

First, let’s unregister the previous forms to start it anew:

>>> from zope.component import getGlobalSiteManager
>>> from zope.publisher.interfaces.browser import IDefaultBrowserLayer
>>> from zope.interface import implementedBy
>>> sm = getGlobalSiteManager()
>>> def unregister_views():
...     done = sm.unregisterAdapter(None, (implementedBy(Mammoth),
...         IDefaultBrowserLayer), Interface, 'edit')
...     done = done and sm.unregisterAdapter(None, (implementedBy(Mammoth),
...         IDefaultBrowserLayer), Interface, 'index')
...     done = done and sm.unregisterAdapter(None, (implementedBy(HerdContainer),
...         IDefaultBrowserLayer), Interface, 'addmammoth')
...     done = done and sm.unregisterAdapter(None, (implementedBy(HerdContainer),
...         IDefaultBrowserLayer), Interface, 'listmammoth')
...     return done
>>> unregister_views()
True

Now, simply define the layout as usual:

>>> from megrok.layout import Layout
>>> class MyLayout(Layout):
...     grok.name('mylayout')
...     grok.context(Interface)
...
...     def render(self):
...         return u"A simple layout\n%s" % self.view.content()
>>> grok_component('MyLayout', MyLayout)
True

And tell the scaffolding grokker to register the forms as layout pages:

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth, aspage=True)

>>> grok_component('mammothcontroller', MammothController)
True
>>> editform = getMultiAdapter((manfred, request), name="edit")
>>> print editform()
A simple layout
<div id="edit-mammoth" class="scaffold-edit">
<form action="http://127.0.0.1" method="post"
    class="edit-form" enctype="multipart/form-data">
...

Customization

The names of the views can be configured using parameters passed to the scaffold directive, e.g.:

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth, addname='add', editname='edit', displayname='index', listname='index')

Besides this, the interfaces used for each form can be set as well:

>>> class IListMammoth(Interface):
...     name = schema.TextLine(title=u"Mammoth's name")

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(add=Mammoth, edit=IMammoth, list=IListMammoth, display=IMammoth)

One can easily disable the automatic registering of views:

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth, list=False)

Putting it all together:

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth, list=IListMammoth, listname='index', edit=False, aspage=True)

The latter will register:

- an add form named after the model's name ('addmammoth')
- a display form named 'index'
- a list view named 'index' displaying the fields defined in IListMammoth
- no edit form
>>> unregister_views()
True
>>> grok_component('mammothcontroller', MammothController)
True
>>> getMultiAdapter((herd, request), name="index")
<ListForm 'index'>
>>> editform = getMultiAdapter((manfred, request), name="edit")
Traceback (most recent call last):
  ...
ComponentLookupError:

Actions

Each form have a subset of these common actions: ‘add’, ‘edit’, ‘apply’, ‘delete’.

Some can be activated or deactivated using attributes like ‘allow_edit’ and ‘allow_delete’.

Your own custom actions can be created using formlib’s action decorator:

>>> from grokcore.formlib import action

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth, listname='index')
...
...     allow_delete = False
...
...     @action('Cancel')
...     def cancel(self, **data):
...         pass
...
...     list_actions = Controller.list_actions.copy()
...
...     @action('Import', list_actions)
...     def do_import(self, **data):
...         self.redirect(self.url(self.context, 'import_view'))

>>> unregister_views()
True
>>> grok_component('mammothcontroller', MammothController)
True
>>> listform = getMultiAdapter((herd, request), name="index")
>>> html = listform()
>>> print listform() # doctest: +NORMALIZE_WHITESPACE
1
<input type="submit" class="button" value="Import" name="actions.import" id="actions.import">

Security

By default the views registered have no permissions set. To change that use the

megrok.scaffold’s ‘require’ directive:

>>> from megrok.scaffold import require as scaffold_require

>>> class MammothController(Controller):
...     grok.context(HerdContainer)
...
...     scaffold(Mammoth)
...     scaffold_require(add='zope.ManageContent', edit='zope.ManageContent')

API

See interfaces.py module.

Changelog

0.2

  • Fixed templates for layout pages (aspage=True)

  • Fixed minor bugs

0.1

  • Initial release

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0.3

This version

0.2

0.1

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