openstack/deb-python-sqlalchemy-utils
Code Issues Proposed changes

Updated EAV docs

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Konsta Vesterinen
2013-11-13 16:33:04 +02:00
parent ccc5323a52
commit d16ca63837
1 changed files with 35 additions and 11 deletions
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46
sqlalchemy_utils/eav.py
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@@ -27,7 +27,7 @@ has some benefits:
from sqlalchemy_utils import JSONType from sqlalchemy_utils import JSONType
class Product(self.Base): class Product(Base):
__tablename__ = 'product' __tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True) id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255)) name = sa.Column(sa.Unicode(255))
@@ -64,13 +64,24 @@ those have their own limitations compared to traditional RDBMS.
from sqlalchemy_utils import MetaType, MetaValue from sqlalchemy_utils import MetaType, MetaValue
class Product(self.Base): class Product(Base):
__tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
category_id = sa.Column(
sa.Integer, sa.ForeignKey(Category.id)
)
category = sa.orm.relationship(Category)
class Category(Base):
__tablename__ = 'product' __tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True) id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255)) name = sa.Column(sa.Unicode(255))
class ProductAttribute(self.Base): class Attribute(Base):
__tablename__ = 'product_attribute' __tablename__ = 'product_attribute'
id = sa.Column(sa.Integer, primary_key=True) id = sa.Column(sa.Integer, primary_key=True)
data_type = sa.Column( data_type = sa.Column(
@@ -81,24 +92,37 @@ those have their own limitations compared to traditional RDBMS.
}) })
) )
name = sa.Column(sa.Unicode(255)) name = sa.Column(sa.Unicode(255))
category_id = sa.Column(
sa.Integer, sa.ForeignKey(Category.id)
)
category = sa.orm.relationship(Category)
class AttributeValue(Base):
__tablename__ = 'attribute_value'
id = sa.Column(sa.Integer, primary_key=True)
product_id = sa.Column( product_id = sa.Column(
sa.Integer, sa.ForeignKey(Product.id) sa.Integer, sa.ForeignKey(Product.id)
) )
product = sa.orm.relationship(Product) product = sa.orm.relationship(Product)
attr_id = sa.Column(
class ProductAttributeValue(self.Base):
__tablename__ = 'product_attribute_value'
id = sa.Column(sa.Integer, primary_key=True)
product_attr_id = sa.Column(
sa.Integer, sa.ForeignKey(ProductAttribute.id) sa.Integer, sa.ForeignKey(ProductAttribute.id)
) )
product_attr = sa.orm.relationship(ProductAttribute) attr = sa.orm.relationship(ProductAttribute)
value = MetaValue('product_attr', 'data_type') value = MetaValue('attr', 'data_type')
Now SQLAlchemy-Utils would create these columns for ProductAttributeValue:
* value_unicode
* value_int
* value_datetime
The `value` attribute is set as hybrid_property.
""" """
from inspect import isclass from inspect import isclass