are metadatas same?
On Tuesday 24 June 2008 19:45:46 Matt Haggard wrote:
> In my various models, I recently noticed that I have been reusing
> my customer table as it relates to many other models. I've been
> making CustomerPart objects in each of the model files and retyping
> the table schema and object (only including the pieces I need for
> that particular case)
>
> Now I'd like to have one customer model and let the other models
> access it -- rather than continually retyping everything.
>
> But I get this error when I break it out (this is when I try to use
> it in a controller in pylons):
> raise exceptions.InvalidRequestError("Could not find table '%s'
> with which to generate a foreign key" % tname)
> InvalidRequestError: Could not find table 'customer' with which to
> generate a foreign key
>
> I've included a before and after (hooray for GIT) of the models:
>
> Thanks!
>
> Matt
>
>
>
> saq.py before (this one works)
> ----------------------------------------------------
> from sqlalchemy import Column, MetaData, Table, types, ForeignKey,
> func
> from sqlalchemy.orm import mapper, relation
>
> from datetime import datetime
>
> from formencode import validators
> from smmodels import fe_obj, NoHTML, SuperDateValidator, fe_setter
>
> metadata = MetaData()
>
> ...
>
> customer_table_part = Table('customer', metadata,
> Column('id', types.Integer, primary_key=True, index=True),
> Column('email', types.Unicode, unique=True, index=True),
> Column('validation_type', types.Unicode),
> )
>
> questionnaire_table = Table('saq_questionnaire', metadata,
> ...
> Column('customer_id', types.Integer, ForeignKey('customer.id'),
> index=True),
> ...
> )
>
> questions_table = Table('saq_questions_new', metadata,
> ...
> )
>
>
> class Questionnaire(fe_setter):
>
> def __str__(self):
> return 'id: %s customer_id: %s' % (self.id,
> self.customer_id)
>
> def __repr__(self):
> return "<Questionnaire(%s, customer_id:%s)>" % (self.id,
> self.customer_id)
>
>
> class Question(fe_setter):
> pass
>
>
> class CustomerPart(fe_setter):
>
> def __init__(self):
> pass
>
>
> mapper(Question, questions_table)
> mapper(CustomerPart, customer_table_part)
> mapper(Questionnaire, questionnaire_table, properties={
> ...
> 'customer' :relation(CustomerPart, backref='questionnaires')
> })
>
>
>
>
>
> saq.py after (all the same except removed references to
> CustomerPart ----------------------------------------------------
> ...
> from smmodels.customer import customer_table, Customer
> ...
>
> mapper(Question, questions_table)
> mapper(Questionnaire, questionnaire_table, properties={
> ...
> 'customer' :relation(Customer, backref='questionnaires')
> })
>
>
> customer.py after (newly created)
> ----------------------------------------------------
> from sqlalchemy import Column, MetaData, Table, types, ForeignKey
> from sqlalchemy.orm import mapper, relation
>
> from formencode import validators
> from smmodels import fe_obj, NoHTML, fe_setter
>
> from datetime import date
>
> metadata = MetaData()
>
> customer_table = Table('customer', metadata,
> Column('id', types.Integer, primary_key=True, index=True),
> Column('email', types.Unicode, unique=True, index=True),
> Column('validation_type', types.Unicode),
> )
>
> class Customer(object):
>
> def __init__(self):
> pass
>
> mapper(Customer, customer_table)
>
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