x/sqlalchemy-migrate
Code Issues Proposed changes

update tests for schema, refactor a bit

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This commit is contained in:
iElectric 2009-06-09 13:31:15 +00:00
parent 2fe569dc69
commit 75494ae226
9 changed files with 261 additions and 134 deletions
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4
TODO
View File

@ -8,3 +8,7 @@ make_update_script_for_model:
- calculated differences between models are actually differences between metas
- columns are not compared?
- even if two "models" are equal, it doesn't yield so
- refactor test_shell to test_api and use TestScript for cmd line testing
- controlledschema.drop() drops whole migrate table, maybe there are some other repositories bound to it!

12
migrate/versioning/exceptions.py
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@ -5,12 +5,10 @@
class Error(Exception):
"""Error base class."""
pass
class ApiError(Error):
"""Base class for API errors."""
pass
class KnownError(ApiError):
@ -23,7 +21,6 @@ class UsageError(ApiError):
class ControlledSchemaError(Error):
"""Base class for controlled schema errors."""
pass
class InvalidVersionError(ControlledSchemaError):
@ -44,44 +41,35 @@ class WrongRepositoryError(ControlledSchemaError):
class NoSuchTableError(ControlledSchemaError):
"""The table does not exist."""
pass
class PathError(Error):
"""Base class for path errors."""
pass
class PathNotFoundError(PathError):
"""A path with no file was required; found a file."""
pass
class PathFoundError(PathError):
"""A path with a file was required; found no file."""
pass
class RepositoryError(Error):
"""Base class for repository errors."""
pass
class InvalidRepositoryError(RepositoryError):
"""Invalid repository error."""
pass
class ScriptError(Error):
"""Base class for script errors."""
pass
class InvalidScriptError(ScriptError):
"""Invalid script error."""
pass
class InvalidVersionError(Error):
"""Invalid version error."""
pass

156
migrate/versioning/schema.py
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@ -5,6 +5,7 @@ from sqlalchemy import (Table, Column, MetaData, String, Text, Integer,
create_engine)
from sqlalchemy.sql import and_
from sqlalchemy import exceptions as sa_exceptions
from sqlalchemy.sql import bindparam
from migrate.versioning import exceptions, genmodel, schemadiff
from migrate.versioning.repository import Repository
@ -34,36 +35,92 @@ class ControlledSchema(object):
if not hasattr(self, 'table') or self.table is None:
try:
self.table = Table(tname, self.meta, autoload=True)
except (exceptions.NoSuchTableError):
except sa_exceptions.NoSuchTableError:
raise exceptions.DatabaseNotControlledError(tname)
# TODO?: verify that the table is correct (# cols, etc.)
result = self.engine.execute(self.table.select(
self.table.c.repository_id == str(self.repository.id)))
try:
data = list(result)[0]
# TODO?: exception if row count is bad
# TODO: check repository id, exception if incorrect
except IndexError:
raise exceptions.DatabaseNotControlledError(tname)
self.version = data['version']
return data
def _get_repository(self):
def drop(self):
"""
Given a database engine, try to guess the repository.
Remove version control from a database.
"""
try:
self.table.drop()
except (sa_exceptions.SQLError):
raise exceptions.DatabaseNotControlledError(str(self.table))
:raise: :exc:`NotImplementedError`
def changeset(self, version=None):
"""API to Changeset creation.
Uses self.version for start version and engine.name to get database name."""
database = self.engine.name
start_ver = self.version
changeset = self.repository.changeset(database, start_ver, version)
return changeset
def runchange(self, ver, change, step):
startver = ver
endver = ver + step
# Current database version must be correct! Don't run if corrupt!
if self.version != startver:
raise exceptions.InvalidVersionError("%s is not %s" % \
(self.version, startver))
# Run the change
change.run(self.engine, step)
# Update/refresh database version
self.update_repository_table(startver, endver)
self.load()
def update_repository_table(self, startver, endver):
"""Update version_table with new information"""
update = self.table.update(and_(self.table.c.version == int(startver),
self.table.c.repository_id == str(self.repository.id)))
self.engine.execute(update, version=int(endver))
def upgrade(self, version=None):
"""
# TODO: no guessing yet; for now, a repository must be supplied
raise NotImplementedError()
Upgrade (or downgrade) to a specified version, or latest version.
"""
changeset = self.changeset(version)
for ver, change in changeset:
self.runchange(ver, change, changeset.step)
def update_db_from_model(self, model):
"""
Modify the database to match the structure of the current Python model.
"""
model = load_model(model)
diff = schemadiff.getDiffOfModelAgainstDatabase(
model, self.engine, excludeTables=[self.repository.version_table])
genmodel.ModelGenerator(diff).applyModel()
self.update_repository_table(self.version, int(self.repository.latest))
self.load()
@classmethod
def create(cls, engine, repository, version=None):
"""
Declare a database to be under a repository's version control.
:raises: :exc:`DatabaseAlreadyControlledError`
:returns: :class:`ControlledSchema`
"""
# Confirm that the version # is valid: positive, integer,
# exists in repos
if isinstance(repository, str):
if isinstance(repository, basestring):
repository = Repository(repository)
version = cls._validate_version(repository, version)
table = cls._create_table_version(engine, repository, version)
@ -76,7 +133,7 @@ class ControlledSchema(object):
"""
Ensures this is a valid version number for this repository.
:raises: :exc:`ControlledSchema.InvalidVersionError` if invalid
:raises: :exc:`InvalidVersionError` if invalid
:return: valid version number
"""
if version is None:
@ -93,6 +150,8 @@ class ControlledSchema(object):
def _create_table_version(cls, engine, repository, version):
"""
Creates the versioning table in a database.
:raises: :exc:`DatabaseAlreadyControlledError`
"""
# Create tables
tname = repository.version_table
@ -104,17 +163,21 @@ class ControlledSchema(object):
Column('repository_path', Text),
Column('version', Integer), )
# there can be multiple repositories/schemas in the same db
if not table.exists():
table.create()
# test for existing repository_id
s = table.select(table.c.repository_id == bindparam("repository_id"))
result = engine.execute(s, repository_id=repository.id)
if result.fetchone():
raise exceptions.DatabaseAlreadyControlledError
# Insert data
try:
engine.execute(table.insert(), repository_id=repository.id,
engine.execute(table.insert().values(
repository_id=repository.id,
repository_path=repository.path,
version=int(version))
except sa_exceptions.IntegrityError:
# An Entry for this repo already exists.
raise exceptions.DatabaseAlreadyControlledError()
version=int(version)))
return table
@classmethod
@ -125,6 +188,7 @@ class ControlledSchema(object):
if isinstance(repository, basestring):
repository = Repository(repository)
model = load_model(model)
diff = schemadiff.getDiffOfModelAgainstDatabase(
model, engine, excludeTables=[repository.version_table])
return diff
@ -136,65 +200,7 @@ class ControlledSchema(object):
"""
if isinstance(repository, basestring):
repository = Repository(repository)
diff = schemadiff.getDiffOfModelAgainstDatabase(
MetaData(), engine, excludeTables=[repository.version_table])
return genmodel.ModelGenerator(diff, declarative).toPython()
def update_db_from_model(self, model):
"""
Modify the database to match the structure of the current Python model.
"""
if isinstance(self.repository, basestring):
self.repository=Repository(self.repository)
model = load_model(model)
diff = schemadiff.getDiffOfModelAgainstDatabase(
model, self.engine, excludeTables=[self.repository.version_table])
genmodel.ModelGenerator(diff).applyModel()
update = self.table.update(
self.table.c.repository_id == str(self.repository.id))
self.engine.execute(update, version=int(self.repository.latest))
def drop(self):
"""
Remove version control from a database.
"""
try:
self.table.drop()
except (sa_exceptions.SQLError):
raise exceptions.DatabaseNotControlledError(str(self.table))
def _engine_db(self, engine):
"""
Returns the database name of an engine - ``postgres``, ``sqlite`` ...
"""
return engine.name
def changeset(self, version=None):
database = self._engine_db(self.engine)
start_ver = self.version
changeset = self.repository.changeset(database, start_ver, version)
return changeset
def runchange(self, ver, change, step):
startver = ver
endver = ver + step
# Current database version must be correct! Don't run if corrupt!
if self.version != startver:
raise exceptions.InvalidVersionError("%s is not %s" % \
(self.version, startver))
# Run the change
change.run(self.engine, step)
# Update/refresh database version
update = self.table.update(
and_(self.table.c.version == int(startver),
self.table.c.repository_id == str(self.repository.id)))
self.engine.execute(update, version=int(endver))
self.load()
def upgrade(self, version=None):
"""
Upgrade (or downgrade) to a specified version, or latest version.
"""
changeset = self.changeset(version)
for ver, change in changeset:
self.runchange(ver, change, changeset.step)

3
test/fixture/pathed.py
View File

@ -21,7 +21,10 @@ class Pathed(base.Base):
def tearDown(self):
super(Pathed, self).tearDown()
try:
sys.path.remove(self.temp_usable_dir)
except:
pass # w00t?
Pathed.purge(self.temp_usable_dir)
@classmethod

13
test/versioning/test_genmodel.py Normal file
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@ -0,0 +1,13 @@
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
from migrate.versioning.genmodel import *
from migrate.versioning.exceptions import *
from test import fixture
class TestModelGenerator(fixture.Pathed, fixture.DB):
level = fixture.DB.TXN

5
test/versioning/test_repository.py
View File

@ -6,6 +6,7 @@ import shutil
from migrate.versioning import exceptions
from migrate.versioning.repository import *
from migrate.versioning.script import *
from nose.tools import raises
from test import fixture
@ -164,6 +165,9 @@ class TestVersionedRepository(fixture.Pathed):
check_changeset((9,), 1)
check_changeset((10,), 0)
# run changes
cs.run('postgres', 'upgrade')
# Can't request a changeset of higher/lower version than this repository
self.assertRaises(Exception, repos.changeset, 'postgres', 11)
self.assertRaises(Exception, repos.changeset, 'postgres', -1)
@ -187,5 +191,6 @@ class TestVersionedRepository(fixture.Pathed):
self.assert_(os.path.exists('%s/versions/1000.py' % self.path_repos))
self.assert_(os.path.exists('%s/versions/1001.py' % self.path_repos))
# TODO: test manage file
# TODO: test changeset

132
test/versioning/test_schema.py
View File

@ -1,16 +1,38 @@
from test import fixture
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import shutil
from migrate.versioning.schema import *
from migrate.versioning import script,exceptions
import os,shutil
from migrate.versioning import script, exceptions, schemadiff
from sqlalchemy import *
from test import fixture
class TestControlledSchema(fixture.Pathed, fixture.DB):
# Transactions break postgres in this test; we'll clean up after ourselves
level = fixture.DB.CONNECT
def setUp(self):
super(TestControlledSchema, self).setUp()
path_repos = self.temp_usable_dir + '/repo/'
self.repos = Repository.create(path_repos, 'repo_name')
def _setup(self, url):
self.setUp()
super(TestControlledSchema, self)._setup(url)
path_repos=self.tmp_repos()
self.repos=Repository.create(path_repos,'repository_name')
self.cleanup()
def _teardown(self):
super(TestControlledSchema, self)._teardown()
self.cleanup()
self.tearDown()
def cleanup(self):
# drop existing version table if necessary
try:
ControlledSchema(self.engine, self.repos).drop()
@ -18,33 +40,43 @@ class TestControlledSchema(fixture.Pathed,fixture.DB):
# No table to drop; that's fine, be silent
pass
def tearDown(self):
self.cleanup()
super(TestControlledSchema, self).tearDown()
@fixture.usedb()
def test_version_control(self):
"""Establish version control on a particular database"""
# Establish version control on this database
dbcontrol = ControlledSchema.create(self.engine, self.repos)
# Trying to create another DB this way fails: table exists
self.assertRaises(exceptions.DatabaseAlreadyControlledError,
ControlledSchema.create, self.engine, self.repos)
# We can load a controlled DB this way, too
dbcontrol0 = ControlledSchema(self.engine, self.repos)
self.assertEquals(dbcontrol, dbcontrol0)
# We can also use a repository path, instead of a repository
dbcontrol0 = ControlledSchema(self.engine, self.repos.path)
self.assertEquals(dbcontrol, dbcontrol0)
# We don't have to use the same connection
engine = create_engine(self.url)
dbcontrol0=ControlledSchema(self.engine,self.repos.path)
dbcontrol0 = ControlledSchema(engine, self.repos.path)
self.assertEquals(dbcontrol, dbcontrol0)
# Trying to create another DB this way fails: table exists
self.assertRaises(exceptions.ControlledSchemaError,
ControlledSchema.create,self.engine,self.repos)
# Clean up:
# un-establish version control
dbcontrol.drop()
# Attempting to drop vc from a db without it should fail
self.assertRaises(exceptions.DatabaseNotControlledError, dbcontrol.drop)
# No table defined should raise error
self.assertRaises(exceptions.DatabaseNotControlledError,
ControlledSchema, self.engine, self.repos)
@fixture.usedb()
def test_version_control_specified(self):
"""Establish version control with a specified version"""
@ -88,3 +120,81 @@ class TestControlledSchema(fixture.Pathed,fixture.DB):
self.assert_(False, repr(version))
except exceptions.InvalidVersionError:
pass
@fixture.usedb()
def test_changeset(self):
"""Create changeset from controlled schema"""
dbschema = ControlledSchema.create(self.engine, self.repos)
# empty schema doesn't have changesets
cs = dbschema.changeset()
self.assertEqual(cs, {})
for i in range(5):
self.repos.create_script('')
self.assertEquals(self.repos.latest, 5)
cs = dbschema.changeset(5)
self.assertEqual(len(cs), 5)
# cleanup
dbschema.drop()
@fixture.usedb()
def test_upgrade_runchange(self):
dbschema = ControlledSchema.create(self.engine, self.repos)
for i in range(10):
self.repos.create_script('')
self.assertEquals(self.repos.latest, 10)
dbschema.upgrade(10)
# TODO: test for table version in db
# cleanup
dbschema.drop()
@fixture.usedb()
def test_create_model(self):
"""Test workflow to generate create_model"""
model = ControlledSchema.create_model(self.engine, self.repos, declarative=False)
self.assertTrue(isinstance(model, basestring))
model = ControlledSchema.create_model(self.engine, self.repos.path, declarative=True)
self.assertTrue(isinstance(model, basestring))
@fixture.usedb()
def test_compare_model_to_db(self):
meta = self.construct_model()
diff = ControlledSchema.compare_model_to_db(self.engine, meta, self.repos)
self.assertTrue(isinstance(diff, schemadiff.SchemaDiff))
diff = ControlledSchema.compare_model_to_db(self.engine, meta, self.repos.path)
self.assertTrue(isinstance(diff, schemadiff.SchemaDiff))
meta.drop_all(self.engine)
@fixture.usedb()
def test_update_db_from_model(self):
dbschema = ControlledSchema.create(self.engine, self.repos)
meta = self.construct_model()
dbschema.update_db_from_model(meta)
# TODO: test for table version in db
# cleanup
dbschema.drop()
meta.drop_all(self.engine)
def construct_model(self):
meta = MetaData()
user = Table('temp_model_schema', meta, Column('id', Integer), Column('user', String))
return meta
# TODO: test how are tables populated in db

4
test/versioning/test_shell.py
View File

@ -16,8 +16,6 @@ from migrate.versioning.exceptions import *
from test import fixture
python_version = sys.version[:3]
class Shell(fixture.Shell):
_cmd = os.path.join('python migrate', 'versioning', 'shell.py')
@ -400,7 +398,7 @@ class TestShellDatabase(Shell, fixture.DB):
self._run_test_sqlfile(upgrade_script,downgrade_script)
@fixture.usedb()
def test_test(self):
def test_command_test(self):
repos_name = 'repos_name'
repos_path = self.tmp()