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-= SEP-003 - Nested items API (!ItemField) =
-
-[[PageOutline(2-5,Contents)]]
-
-||'''SEP:'''||3||
-||'''Title:'''||Nested items API (!ItemField) ||
-||'''Author:'''||Pablo Hoffman||
-||'''Created:'''||2009-07-19||
-||'''Status'''||Obsoleted by [wiki:SEP-008]||
-
-== Introduction ==
-
-This page presents different usage scenarios for the new nested items field API called !ItemField.
-
-== Prerequisites ==
-
-This API proposal relies on the following API:
-
- 1. instantiating a item with an item instance as its first argument (ie. {{{item2 = MyItem(item1)}}}) must return a '''copy''' of the first item instance)
- 2. items can be instantiated using this syntax: {{{item = Item(attr1=value1, attr2=value2)}}}
-
-== Proposed Implementation of !ItemField ==
-
-{{{
-#!python
-from scrapy.item.fields import BaseField
-
-class ItemField(BaseField):
-    def __init__(self, item_type, default=None):
-        self._item_type = item_type
-        super(ItemField, self).__init__(default)
-
-    def to_python(self, value):
-        return self._item_type(value) if not isinstance(value, self._item_type) else value
-
-    def get_default(self):
-        # WARNING: returns default item instead of a copy - this must be well documented, as Items are mutable objects and may lead to unexpected behaviors
-        # always returning a copy may not be desirable either (see Supplier item, for example). this method can be overridden to change this behaviour
-        return self._default
-}}}
-
-== Usage Scenarios ==
-
-=== Defining an item containing !ItemField's ===
-
-{{{
-#!python
-from scrapy.item.models import Item
-from scrapy.item.fields import ListField, ItemField, TextField, UrlField, DecimalField
-
-class Supplier(Item):
-    name = TextField(default="anonymous supplier")
-    url = UrlField()
-
-class Variant(Item):
-    name = TextField(required=True)
-    url = UrlField()
-    price = DecimalField()
-
-class Product(Variant):
-    supplier = ItemField(Supplier, default=Supplier(name="default supplier")
-    variants = ListField(ItemField(Variant))
-    
-    # these ones are used for documenting default value examples
-    supplier2 = ItemField(Supplier)
-    variants2 = ListField(ItemField(Variant), default=[])
-}}}
-
-It's important to note here that the (perhaps most intuitive) way of defining a Product-Variant 
-relationship (ie. defining a recursive !ItemField) doesn't work. For example, this fails to compile:
-
-{{{
-#!python
-class Product(Item):
-    variants = ItemField(Product) # Fails to compile
-}}}
-
-=== Assigning an item field ===
-
-{{{
-#!python
-
-supplier = Supplier(name="Supplier 1", url="http://example.com")
-
-p = Product()
-
-# standard assignment
-p['supplier'] = supplier
-# this also works as it tries to instantiate a Supplier with the given dict
-p['supplier'] = {'name': 'Supplier 1' url='http://example.com'}
-# this fails because it can't instantiate a Supplier 
-p['supplier'] = 'Supplier 1'
-# this fails because url doesn't have the valid type
-p['supplier'] = {'name': 'Supplier 1' url=123}
-
-v1 = Variant()
-v1['name'] = "lala"
-v1['price'] = Decimal("100")
-
-v2 = Variant()
-v2['name'] = "lolo"
-v2['price'] = Decimal("150")
-
-# standard assignment
-p['variants'] = [v1, v2] # OK
-# can also instantiate at assignment time
-p['variants'] = [v1, Variant(name="lolo", price=Decimal("150")]
-# this also works as it tries to instantiate a Variant with the given dict
-p['variants'] = [v1, {'name': 'lolo', 'price': Decimal("150")] 
-# this fails because it can't instantiate a Variant 
-p['variants'] = [v1, 'test']
-# this fails because 'coco' is not a valid value for price
-p['variants'] = [v1, {'name': 'lolo', 'price': 'coco'] 
-}}}
-
-=== Default values ===
-
-{{{
-#!python
-p = Product()
-
-p['supplier'] # returns: Supplier(name='default supplier')
-p['supplier2'] # raises KeyError
-p['supplier2'] = Supplier()
-p['supplier2'] # returns: Supplier(name='anonymous supplier')
-
-p['variants'] # raises KeyError
-p['variants2'] # returns []
-
-p['categories'] # raises KeyError
-p.get('categories') # returns None
-
-p['numbers'] # returns []
-}}}
-
-=== Accesing and changing nested item values ===
-
-{{{
-#!python
-
-p = Product(supplier=Supplier(name="some name", url="http://example.com"))
-p['supplier']['url'] # returns 'http://example.com'
-p['supplier']['url'] = "http://www.other.com" # works as expected
-p['supplier']['url'] = 123 # fails: wrong type for supplier url
-
-p['variants'] = [v1, v2]
-p['variants'][0]['name'] # returns v1 name
-p['variants'][1]['name'] # returns v2 name
-
-# XXX: decide what to do about these cases:
-p['variants'].append(v3) # works but doesn't check type of v3
-p['variants'].append(1) # works but shouldn't?
-}}}