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Tableau is a collection of helper classes for building test fixtures and seed data

Project description

Tableau is a collection of helper classes for building test fixtures and seed data.

  • Model composition without any predefined schemas. The model object relationships are automatically deduced through the value annotations:

    from tableau import Datum
    
    foo = Datum(
      'Foo', ('id'), # schema name / identifiers
      id=1,
      field_a=1,
      field_b=2,
      collection=one_to_many([
        Datum(
          'Bar', auto('id'), # id will be automagically generated by the walker
          field_c=1
          ),
        Datum(
          'Bar', auto('id'),
          field_c=1
          ),
        ],
        referring_fields='foo_id'
        )
      )
    
  • Export the model object graph to plain ANSI SQL statements, in the ORM-agnostic manner:

    import sys
    from tableau import Datum, DataSuite, DataWalker
    from tableau.sql import SQLGenerator
    
    # ...
    
    suite = DataSuite()
    DataWalker(suite)(foo)
    SQLGenerator(sys.stdout, encoding='utf-8')(suite)
    

    The above yields the following SQL statements:

    INSERT INTO `Foo` (`id`, `field_a`, `field_b`) VALUES
    (1, 1, 2);
    INSERT INTO `Bar` (`id`, `field_c`, `foo_id`) VALUES
    (1, 1, 1),
    (2, 1, 1);
    
  • Automatically mapping the existing SQLAlchemy tables / declarative classes to the Data:

    from tableau.sqla import newSADatum
    
    # metadata = ...
    # Base = ...
    # sessoin = ...
    
    class Foo(Base):
      __tablename__ = 'foos'
      id = Column(Integer, primary_key=True)
      field = Column(String)
    
      def some_model_specific_method(self):
        return self.field
    
    Datum = newSADatum(metadata, Base)
    datum = Datum(
      'foos', ('id'),
      field='test'
      )
    print datum.some_model_specific_method() # 'test'
    session.add(datum) # it can even be added to the session!
    

Change history

0.0.0
Unreleased.
0.0.1
First release. No docs!
0.0.2
Support mapping to SQLAlchemy tables and declarative classses. Still no docs!

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0.0.3

This version
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0.0.2

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0.0.1

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