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Make the table schema a bit more introspectable

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This solves two problems: first, the relationships are now defined in
the class they apply to, rather than in a separate section of the module,
and second, their metadata -- both creation arguments and extra info such
as `description` (or, later, possibly, info for API properties) -- is
stored.
This commit is contained in:
Petr Viktorin 2012-02-12 16:19:09 +01:00
parent 96499fae30
commit 0cb1f8a1b8
2 changed files with 88 additions and 55 deletions
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1
pokedex/db/multilang.py
View file

@ -118,6 +118,7 @@ def create_translation_table(_table_name, foreign_class, relation_name,
Translations = type(_table_name, (object,), {
'_language_identifier': association_proxy('local_language', 'identifier'),
'relation_name': relation_name,
})
# Create the table object

142
pokedex/db/tables.py
View file

@ -30,7 +30,8 @@ classes in that module can be used to change the default language.
import collections
from functools import partial
from sqlalchemy import Column, ForeignKey, MetaData, PrimaryKeyConstraint, Table, UniqueConstraint
from sqlalchemy import (Column, ForeignKey, MetaData, PrimaryKeyConstraint,
Table, UniqueConstraint)
from sqlalchemy.ext.declarative import declarative_base, DeclarativeMeta
from sqlalchemy.ext.associationproxy import association_proxy
from sqlalchemy.orm import backref, relationship
@ -76,6 +77,7 @@ class TableMetaclass(DeclarativeMeta):
if hasattr(cls, '__tablename__'):
mapped_classes.append(cls)
cls.translation_classes = []
cls.relationship_info = {}
metadata = MetaData()
TableBase = declarative_base(metadata=metadata, cls=TableSuperclass, metaclass=TableMetaclass)
@ -1400,6 +1402,69 @@ class PokemonSpecies(TableBase):
forms_switchable = Column(Boolean, nullable=False,
info=dict(description=u"True iff a particular individual of this species can switch beween its different forms."))
@staticmethod
def _add_relationships(add_relationship, **kwargs):
add_relationship('parent_species', PokemonSpecies,
primaryjoin=PokemonSpecies.evolves_from_species_id==PokemonSpecies.id,
remote_side=[PokemonSpecies.id],
backref='child_species',
info=dict(
description=u"The species from which this one evolves"))
add_relationship('evolutions', PokemonEvolution,
primaryjoin=PokemonSpecies.id==PokemonEvolution.evolved_species_id,
backref=backref('evolved_species',
innerjoin=True,
lazy='joined'))
add_relationship('flavor_text', PokemonSpeciesFlavorText,
order_by=PokemonSpeciesFlavorText.version_id.asc(),
backref='species')
add_relationship('growth_rate', GrowthRate,
innerjoin=True,
backref='evolution_chains')
add_relationship('habitat', PokemonHabitat,
backref='species')
add_relationship('color', PokemonColor,
innerjoin=True,
backref='species')
add_relationship('egg_groups', EggGroup,
secondary=PokemonEggGroup.__table__,
innerjoin=True,
order_by=PokemonEggGroup.egg_group_id.asc(),
backref=backref('species', order_by=Pokemon.order.asc()))
add_relationship('forms', PokemonForm,
secondary=Pokemon.__table__,
primaryjoin=PokemonSpecies.id==Pokemon.species_id,
secondaryjoin=Pokemon.id==PokemonForm.pokemon_id,
order_by=(PokemonForm.order.asc(),
PokemonForm.form_identifier.asc()))
add_relationship('default_form', PokemonForm,
secondary=Pokemon.__table__,
primaryjoin=and_(PokemonSpecies.id==Pokemon.species_id,
Pokemon.is_default==True),
secondaryjoin=and_(Pokemon.id==PokemonForm.pokemon_id,
PokemonForm.is_default==True),
uselist=False,
info=dict(
description=u"A representative form of this species"))
add_relationship('default_pokemon', Pokemon,
primaryjoin=and_(
PokemonSpecies.id==Pokemon.species_id,
Pokemon.is_default==True),
uselist=False, lazy='joined')
add_relationship('evolution_chain', EvolutionChain,
innerjoin=True,
backref=backref('species', order_by=PokemonSpecies.id.asc()))
add_relationship('dex_numbers', PokemonDexNumber,
innerjoin=True,
order_by=PokemonDexNumber.pokedex_id.asc(),
backref='species')
add_relationship('generation', Generation,
innerjoin=True,
backref='species')
add_relationship('shape', PokemonShape,
innerjoin=True,
backref='species')
create_translation_table('pokemon_species_names', PokemonSpecies, 'names',
relation_lazy='joined',
name = Column(Unicode(20), nullable=True, index=True,
@ -1607,6 +1672,27 @@ class VersionGroupRegion(TableBase):
### Relationships down here, to avoid dependency ordering problems
def add_relationships():
for cls in mapped_classes:
try:
add_relationships = cls._add_relationships
except AttributeError:
pass
else:
def add_relationship(name, argument, secondary=None, **kwargs):
cls.relationship_info.setdefault('_order', [])
cls.relationship_info['_order'].append(name)
cls.relationship_info[name] = kwargs.pop('info', {})
cls.relationship_info[name].update(kwargs)
cls.relationship_info[name].update(dict(
type='relationship',
argument=argument,
secondary=secondary))
setattr(cls, name, relationship(argument, secondary=secondary,
**kwargs))
add_relationships(add_relationship=add_relationship)
add_relationships()
Ability.changelog = relationship(AbilityChangelog,
order_by=AbilityChangelog.changed_in_version_group_id.desc(),
backref=backref('ability', innerjoin=True, lazy='joined'))
@ -2005,60 +2091,6 @@ PokemonMove.method = relationship(PokemonMoveMethod,
PokemonStat.stat = relationship(Stat,
innerjoin=True, lazy='joined')
PokemonSpecies.parent_species = relationship(PokemonSpecies,
primaryjoin=PokemonSpecies.evolves_from_species_id==PokemonSpecies.id,
remote_side=[PokemonSpecies.id],
backref='child_species')
PokemonSpecies.evolutions = relationship(PokemonEvolution,
primaryjoin=PokemonSpecies.id==PokemonEvolution.evolved_species_id,
backref=backref('evolved_species', innerjoin=True, lazy='joined'))
PokemonSpecies.flavor_text = relationship(PokemonSpeciesFlavorText,
order_by=PokemonSpeciesFlavorText.version_id.asc(),
backref='species')
PokemonSpecies.growth_rate = relationship(GrowthRate,
innerjoin=True,
backref='evolution_chains')
PokemonSpecies.habitat = relationship(PokemonHabitat,
backref='species')
PokemonSpecies.color = relationship(PokemonColor,
innerjoin=True,
backref='species')
PokemonSpecies.egg_groups = relationship(EggGroup,
secondary=PokemonEggGroup.__table__,
innerjoin=True,
order_by=PokemonEggGroup.egg_group_id.asc(),
backref=backref('species', order_by=Pokemon.order.asc()))
PokemonSpecies.forms = relationship(PokemonForm,
secondary=Pokemon.__table__,
primaryjoin=PokemonSpecies.id==Pokemon.species_id,
secondaryjoin=Pokemon.id==PokemonForm.pokemon_id,
order_by=(PokemonForm.order.asc(), PokemonForm.form_identifier.asc()))
PokemonSpecies.default_form = relationship(PokemonForm,
secondary=Pokemon.__table__,
primaryjoin=and_(PokemonSpecies.id==Pokemon.species_id,
Pokemon.is_default==True),
secondaryjoin=and_(Pokemon.id==PokemonForm.pokemon_id,
PokemonForm.is_default==True),
uselist=False)
PokemonSpecies.default_pokemon = relationship(Pokemon,
primaryjoin=and_(
PokemonSpecies.id==Pokemon.species_id,
Pokemon.is_default==True),
uselist=False, lazy='joined')
PokemonSpecies.evolution_chain = relationship(EvolutionChain,
innerjoin=True,
backref=backref('species', order_by=PokemonSpecies.id.asc()))
PokemonSpecies.dex_numbers = relationship(PokemonDexNumber,
innerjoin=True,
order_by=PokemonDexNumber.pokedex_id.asc(),
backref='species')
PokemonSpecies.generation = relationship(Generation,
innerjoin=True,
backref='species')
PokemonSpecies.shape = relationship(PokemonShape,
innerjoin=True,
backref='species')
PokemonSpeciesFlavorText.version = relationship(Version, innerjoin=True, lazy='joined')
PokemonSpeciesFlavorText.language = relationship(Language, innerjoin=True, lazy='joined')