Model many-to-many over three tables in SQLAlchemy
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I have difficulty to model these relations.
There is products, each one belonging to a product_type. Product_types have a list of different features eg. color, size, weight, volume, in a relation of many-to-many. In their turn, each features have differents feature_options eg. red, blue, green, black for colors. Finally products have some of the feature_options. One example should be the product BIC2006 which have the product_type pen, whose features are color and weight, and which has in these features the feature_options red and blue for the color and 1g and 2g for the weight.
At the end I would like to store the feature_options by products and query by products the list of feature_options by feature :
BIC2006 - Pen
Color : Red, Blue
Weight : 1g, 2g
What should be the best DB model to use with SQLAlchemy?
For now, as I need to store the feature_options by products I tried with this, but I'm not sure about how to retrieve the sort by features :
class ProductTypes_Features(Base):
__tablename__ = 'product_types_features'
product_type_id = Column(Integer, ForeignKey('product_types.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
class Feature_FeatureOptions(Base):
__tablename__ = 'feature_feature_options'
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
class Product_FeatureOptions(Base):
__tablename__ = 'product_feature_options'
product_id = Column(Integer, ForeignKey('products.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id')) #??
class Products(Base):
__tablename__ = 'product'
id = Column(Integer, primary_key=True)
product_type_id = Column(Integer, ForeignKey('product_types.id'))
feature_options = relationship("Product_FeatureOptions")
class FeatureOptions(Base):
__tablename__ = 'feature_options'
id = Column(Integer, primary_key=True)
class Features(Base):
__tablename__ = 'features'
id = Column(Integer, primary_key=True)
feature_options = relationship("Feature_FeatureOptions")
class ProductTypes(Base):
__tablename__ = 'product_types'
id = Column(Integer, primary_key=True)
features = relationship("ProductType_Features")
How can I query?
session.query(Products.id,
Products.feature_options.feature_id,
Products.feature_options.feature_option_id).
order_by(...).all()
Thanks a lot for your best practices advices!
python sql sqlalchemy
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up vote
0
down vote
favorite
I have difficulty to model these relations.
There is products, each one belonging to a product_type. Product_types have a list of different features eg. color, size, weight, volume, in a relation of many-to-many. In their turn, each features have differents feature_options eg. red, blue, green, black for colors. Finally products have some of the feature_options. One example should be the product BIC2006 which have the product_type pen, whose features are color and weight, and which has in these features the feature_options red and blue for the color and 1g and 2g for the weight.
At the end I would like to store the feature_options by products and query by products the list of feature_options by feature :
BIC2006 - Pen
Color : Red, Blue
Weight : 1g, 2g
What should be the best DB model to use with SQLAlchemy?
For now, as I need to store the feature_options by products I tried with this, but I'm not sure about how to retrieve the sort by features :
class ProductTypes_Features(Base):
__tablename__ = 'product_types_features'
product_type_id = Column(Integer, ForeignKey('product_types.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
class Feature_FeatureOptions(Base):
__tablename__ = 'feature_feature_options'
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
class Product_FeatureOptions(Base):
__tablename__ = 'product_feature_options'
product_id = Column(Integer, ForeignKey('products.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id')) #??
class Products(Base):
__tablename__ = 'product'
id = Column(Integer, primary_key=True)
product_type_id = Column(Integer, ForeignKey('product_types.id'))
feature_options = relationship("Product_FeatureOptions")
class FeatureOptions(Base):
__tablename__ = 'feature_options'
id = Column(Integer, primary_key=True)
class Features(Base):
__tablename__ = 'features'
id = Column(Integer, primary_key=True)
feature_options = relationship("Feature_FeatureOptions")
class ProductTypes(Base):
__tablename__ = 'product_types'
id = Column(Integer, primary_key=True)
features = relationship("ProductType_Features")
How can I query?
session.query(Products.id,
Products.feature_options.feature_id,
Products.feature_options.feature_option_id).
order_by(...).all()
Thanks a lot for your best practices advices!
python sql sqlalchemy
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have difficulty to model these relations.
There is products, each one belonging to a product_type. Product_types have a list of different features eg. color, size, weight, volume, in a relation of many-to-many. In their turn, each features have differents feature_options eg. red, blue, green, black for colors. Finally products have some of the feature_options. One example should be the product BIC2006 which have the product_type pen, whose features are color and weight, and which has in these features the feature_options red and blue for the color and 1g and 2g for the weight.
At the end I would like to store the feature_options by products and query by products the list of feature_options by feature :
BIC2006 - Pen
Color : Red, Blue
Weight : 1g, 2g
What should be the best DB model to use with SQLAlchemy?
For now, as I need to store the feature_options by products I tried with this, but I'm not sure about how to retrieve the sort by features :
class ProductTypes_Features(Base):
__tablename__ = 'product_types_features'
product_type_id = Column(Integer, ForeignKey('product_types.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
class Feature_FeatureOptions(Base):
__tablename__ = 'feature_feature_options'
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
class Product_FeatureOptions(Base):
__tablename__ = 'product_feature_options'
product_id = Column(Integer, ForeignKey('products.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id')) #??
class Products(Base):
__tablename__ = 'product'
id = Column(Integer, primary_key=True)
product_type_id = Column(Integer, ForeignKey('product_types.id'))
feature_options = relationship("Product_FeatureOptions")
class FeatureOptions(Base):
__tablename__ = 'feature_options'
id = Column(Integer, primary_key=True)
class Features(Base):
__tablename__ = 'features'
id = Column(Integer, primary_key=True)
feature_options = relationship("Feature_FeatureOptions")
class ProductTypes(Base):
__tablename__ = 'product_types'
id = Column(Integer, primary_key=True)
features = relationship("ProductType_Features")
How can I query?
session.query(Products.id,
Products.feature_options.feature_id,
Products.feature_options.feature_option_id).
order_by(...).all()
Thanks a lot for your best practices advices!
python sql sqlalchemy
I have difficulty to model these relations.
There is products, each one belonging to a product_type. Product_types have a list of different features eg. color, size, weight, volume, in a relation of many-to-many. In their turn, each features have differents feature_options eg. red, blue, green, black for colors. Finally products have some of the feature_options. One example should be the product BIC2006 which have the product_type pen, whose features are color and weight, and which has in these features the feature_options red and blue for the color and 1g and 2g for the weight.
At the end I would like to store the feature_options by products and query by products the list of feature_options by feature :
BIC2006 - Pen
Color : Red, Blue
Weight : 1g, 2g
What should be the best DB model to use with SQLAlchemy?
For now, as I need to store the feature_options by products I tried with this, but I'm not sure about how to retrieve the sort by features :
class ProductTypes_Features(Base):
__tablename__ = 'product_types_features'
product_type_id = Column(Integer, ForeignKey('product_types.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
class Feature_FeatureOptions(Base):
__tablename__ = 'feature_feature_options'
feature_id = Column(Integer, ForeignKey('features.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
class Product_FeatureOptions(Base):
__tablename__ = 'product_feature_options'
product_id = Column(Integer, ForeignKey('products.id'), primary_key=True)
feature_options_id = Column(Integer, ForeignKey('feature_options.id'), primary_key=True)
feature_id = Column(Integer, ForeignKey('features.id')) #??
class Products(Base):
__tablename__ = 'product'
id = Column(Integer, primary_key=True)
product_type_id = Column(Integer, ForeignKey('product_types.id'))
feature_options = relationship("Product_FeatureOptions")
class FeatureOptions(Base):
__tablename__ = 'feature_options'
id = Column(Integer, primary_key=True)
class Features(Base):
__tablename__ = 'features'
id = Column(Integer, primary_key=True)
feature_options = relationship("Feature_FeatureOptions")
class ProductTypes(Base):
__tablename__ = 'product_types'
id = Column(Integer, primary_key=True)
features = relationship("ProductType_Features")
How can I query?
session.query(Products.id,
Products.feature_options.feature_id,
Products.feature_options.feature_option_id).
order_by(...).all()
Thanks a lot for your best practices advices!
python sql sqlalchemy
python sql sqlalchemy
asked Nov 10 at 20:00
Romain
263
263
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