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import sqlalchemy as sa
from sqlalchemy import Column
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import Table
from ._autogen_fixtures import AutogenFixtureTest
from ... import testing
from ...testing import eq_
from ...testing import is_
from ...testing import is_true
from ...testing import mock
from ...testing import TestBase
class AutogenerateComputedTest(AutogenFixtureTest, TestBase):
__requires__ = ("computed_columns",)
__backend__ = True
def test_add_computed_column(self):
m1 = MetaData()
m2 = MetaData()
Table("user", m1, Column("id", Integer, primary_key=True))
Table(
"user",
m2,
Column("id", Integer, primary_key=True),
Column("foo", Integer, sa.Computed("5")),
)
diffs = self._fixture(m1, m2)
eq_(diffs[0][0], "add_column")
eq_(diffs[0][2], "user")
eq_(diffs[0][3].name, "foo")
c = diffs[0][3].computed
is_true(isinstance(c, sa.Computed))
is_(c.persisted, None)
eq_(str(c.sqltext), "5")
def test_remove_computed_column(self):
m1 = MetaData()
m2 = MetaData()
Table(
"user",
m1,
Column("id", Integer, primary_key=True),
Column("foo", Integer, sa.Computed("5")),
)
Table("user", m2, Column("id", Integer, primary_key=True))
diffs = self._fixture(m1, m2)
eq_(diffs[0][0], "remove_column")
eq_(diffs[0][2], "user")
c = diffs[0][3]
eq_(c.name, "foo")
is_true(isinstance(c.computed, sa.Computed))
is_true(isinstance(c.server_default, sa.Computed))
@testing.combinations(
lambda: (None, sa.Computed("bar*5")),
(lambda: (sa.Computed("bar*5"), None)),
lambda: (
sa.Computed("bar*5"),
sa.Computed("bar * 42", persisted=True),
),
lambda: (sa.Computed("bar*5"), sa.Computed("bar * 42")),
)
def test_cant_change_computed_warning(self, test_case):
arg_before, arg_after = testing.resolve_lambda(test_case, **locals())
m1 = MetaData()
m2 = MetaData()
arg_before = [] if arg_before is None else [arg_before]
arg_after = [] if arg_after is None else [arg_after]
Table(
"user",
m1,
Column("id", Integer, primary_key=True),
Column("bar", Integer),
Column("foo", Integer, *arg_before),
)
Table(
"user",
m2,
Column("id", Integer, primary_key=True),
Column("bar", Integer),
Column("foo", Integer, *arg_after),
)
with mock.patch("alembic.util.warn") as mock_warn:
diffs = self._fixture(m1, m2)
eq_(
mock_warn.mock_calls,
[mock.call("Computed default on user.foo cannot be modified")],
)
eq_(list(diffs), [])
@testing.combinations(
lambda: (None, None),
lambda: (sa.Computed("5"), sa.Computed("5")),
lambda: (sa.Computed("bar*5"), sa.Computed("bar*5")),
lambda: (sa.Computed("bar*5"), sa.Computed("bar * \r\n\t5")),
)
def test_computed_unchanged(self, test_case):
arg_before, arg_after = testing.resolve_lambda(test_case, **locals())
m1 = MetaData()
m2 = MetaData()
arg_before = [] if arg_before is None else [arg_before]
arg_after = [] if arg_after is None else [arg_after]
Table(
"user",
m1,
Column("id", Integer, primary_key=True),
Column("bar", Integer),
Column("foo", Integer, *arg_before),
)
Table(
"user",
m2,
Column("id", Integer, primary_key=True),
Column("bar", Integer),
Column("foo", Integer, *arg_after),
)
with mock.patch("alembic.util.warn") as mock_warn:
diffs = self._fixture(m1, m2)
eq_(mock_warn.mock_calls, [])
eq_(list(diffs), [])
|
