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from sqlalchemy import MetaData, Column, Table, Integer, String, Text, \
Numeric, CHAR, ForeignKey, Index, UniqueConstraint, CheckConstraint, text
from sqlalchemy.engine.reflection import Inspector
from alembic import autogenerate
from alembic.migration import MigrationContext
from alembic.testing import config
from alembic.testing.env import staging_env, clear_staging_env
from alembic.testing import eq_
from alembic.ddl.base import _fk_spec
names_in_this_test = set()
from sqlalchemy import event
@event.listens_for(Table, "after_parent_attach")
def new_table(table, parent):
names_in_this_test.add(table.name)
def _default_include_object(obj, name, type_, reflected, compare_to):
if type_ == "table":
return name in names_in_this_test
else:
return True
_default_object_filters = [
_default_include_object
]
class ModelOne(object):
__requires__ = ('unique_constraint_reflection', )
schema = None
@classmethod
def _get_db_schema(cls):
schema = cls.schema
m = MetaData(schema=schema)
Table('user', m,
Column('id', Integer, primary_key=True),
Column('name', String(50)),
Column('a1', Text),
Column("pw", String(50)),
Index('pw_idx', 'pw')
)
Table('address', m,
Column('id', Integer, primary_key=True),
Column('email_address', String(100), nullable=False),
)
Table('order', m,
Column('order_id', Integer, primary_key=True),
Column("amount", Numeric(8, 2), nullable=False,
server_default=text("0")),
CheckConstraint('amount >= 0', name='ck_order_amount')
)
Table('extra', m,
Column("x", CHAR),
Column('uid', Integer, ForeignKey('user.id'))
)
return m
@classmethod
def _get_model_schema(cls):
schema = cls.schema
m = MetaData(schema=schema)
Table('user', m,
Column('id', Integer, primary_key=True),
Column('name', String(50), nullable=False),
Column('a1', Text, server_default="x")
)
Table('address', m,
Column('id', Integer, primary_key=True),
Column('email_address', String(100), nullable=False),
Column('street', String(50)),
UniqueConstraint('email_address', name="uq_email")
)
Table('order', m,
Column('order_id', Integer, primary_key=True),
Column('amount', Numeric(10, 2), nullable=True,
server_default=text("0")),
Column('user_id', Integer, ForeignKey('user.id')),
CheckConstraint('amount > -1', name='ck_order_amount'),
)
Table('item', m,
Column('id', Integer, primary_key=True),
Column('description', String(100)),
Column('order_id', Integer, ForeignKey('order.order_id')),
CheckConstraint('len(description) > 5')
)
return m
class _ComparesFKs(object):
def _assert_fk_diff(
self, diff, type_, source_table, source_columns,
target_table, target_columns, name=None, conditional_name=None,
source_schema=None):
# the public API for ForeignKeyConstraint was not very rich
# in 0.7, 0.8, so here we use the well-known but slightly
# private API to get at its elements
(fk_source_schema, fk_source_table,
fk_source_columns, fk_target_schema, fk_target_table,
fk_target_columns) = _fk_spec(diff[1])
eq_(diff[0], type_)
eq_(fk_source_table, source_table)
eq_(fk_source_columns, source_columns)
eq_(fk_target_table, target_table)
eq_(fk_source_schema, source_schema)
eq_([elem.column.name for elem in diff[1].elements],
target_columns)
if conditional_name is not None:
if config.requirements.no_fk_names.enabled:
eq_(diff[1].name, None)
elif conditional_name == 'servergenerated':
fks = Inspector.from_engine(self.bind).\
get_foreign_keys(source_table)
server_fk_name = fks[0]['name']
eq_(diff[1].name, server_fk_name)
else:
eq_(diff[1].name, conditional_name)
else:
eq_(diff[1].name, name)
class AutogenTest(_ComparesFKs):
def _flatten_diffs(self, diffs):
for d in diffs:
if isinstance(d, list):
for fd in self._flatten_diffs(d):
yield fd
else:
yield d
@classmethod
def _get_bind(cls):
return config.db
configure_opts = {}
@classmethod
def setup_class(cls):
staging_env()
cls.bind = cls._get_bind()
cls.m1 = cls._get_db_schema()
cls.m1.create_all(cls.bind)
cls.m2 = cls._get_model_schema()
@classmethod
def teardown_class(cls):
cls.m1.drop_all(cls.bind)
clear_staging_env()
def setUp(self):
self.conn = conn = self.bind.connect()
ctx_opts = {
'compare_type': True,
'compare_server_default': True,
'target_metadata': self.m2,
'upgrade_token': "upgrades",
'downgrade_token': "downgrades",
'alembic_module_prefix': 'op.',
'sqlalchemy_module_prefix': 'sa.',
}
if self.configure_opts:
ctx_opts.update(self.configure_opts)
self.context = context = MigrationContext.configure(
connection=conn,
opts=ctx_opts
)
connection = context.bind
self.autogen_context = {
'imports': set(),
'connection': connection,
'dialect': connection.dialect,
'context': context
}
def tearDown(self):
self.conn.close()
class AutogenFixtureTest(_ComparesFKs):
def _fixture(
self, m1, m2, include_schemas=False,
opts=None, object_filters=_default_object_filters):
self.metadata, model_metadata = m1, m2
self.metadata.create_all(self.bind)
with self.bind.connect() as conn:
ctx_opts = {
'compare_type': True,
'compare_server_default': True,
'target_metadata': model_metadata,
'upgrade_token': "upgrades",
'downgrade_token': "downgrades",
'alembic_module_prefix': 'op.',
'sqlalchemy_module_prefix': 'sa.',
}
if opts:
ctx_opts.update(opts)
self.context = context = MigrationContext.configure(
connection=conn,
opts=ctx_opts
)
connection = context.bind
autogen_context = {
'imports': set(),
'connection': connection,
'dialect': connection.dialect,
'context': context,
'metadata': model_metadata,
'object_filters': object_filters,
'include_schemas': include_schemas
}
diffs = []
autogenerate._produce_net_changes(
autogen_context, diffs
)
return diffs
reports_unnamed_constraints = False
def setUp(self):
staging_env()
self.bind = config.db
def tearDown(self):
if hasattr(self, 'metadata'):
self.metadata.drop_all(self.bind)
clear_staging_env()
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