Python Django单元测试在多个Postgres架构中失败
My Postgres DB有3种模式:默认模式、cedirData模式和webData模式 对于那些指向不同于默认模式的模式的模型,我指定如下:Python Django单元测试在多个Postgres架构中失败,python,django,postgresql,Python,Django,Postgresql,My Postgres DB有3种模式:默认模式、cedirData模式和webData模式 对于那些指向不同于默认模式的模式的模型,我指定如下: class Person(models.Model): first_name = models.CharField(max_length=200, null=False, blank=False) last_name = models.CharField(max_length=200, null=False, blank=False)
class Person(models.Model):
first_name = models.CharField(max_length=200, null=False, blank=False)
last_name = models.CharField(max_length=200, null=False, blank=False)
class Meta:
db_table = 'cedirData\".\"persons'
应用程序工作正常,但当我尝试运行测试时:
$ ./manage.py test
我得到以下信息:
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 160, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 63, in migrate
self.apply_migration(migration, fake=fake)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 97, in apply_migration
migration.apply(project_state, schema_editor)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/migrations/migration.py", line 107, in apply
operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/migrations/operations/models.py", line 36, in database_forwards
schema_editor.create_model(model)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/backends/schema.py", line 270, in create_model
self.execute(sql, params)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/backends/schema.py", line 98, in execute
cursor.execute(sql, params)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/wbrunetti/.virtualenvs/cedir/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: schema "cedirData" does not exist
看起来可能与迁移有关。由于DB表已经存在,我只是创建了初始迁移并运行了一个--false:
测试数据库仅使用默认模式创建
我正在使用Django 1.7和Python 2.7.6
任何想法或想法都会有帮助
谢谢 模式没有在许多其他数据库引擎中使用。通过在模型中指定模式,您已经在postgres代码中引入了依赖项 有两种方法可以解决你的问题 首先,您可以向postgres用户添加默认搜索路径。这种方法的缺点是模式不能再用于名称空间,但优点是,如果数据库更改为其他引擎,代码将正常工作。可以通过选择一些标准的表命名方式来实现表的命名,类似于Django默认的命名方式(例如appName\u className) 有两种方法可以实现这一点。按这种方式执行的postgres命令是:
ALTER USER (your user) SET search_path = "$user",(schema1),(schema2),(schema3),(...)
django唯一的方法是:
# Warning! This is untested, I just glanced at the docs and it looks right.
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
# some configuration here
'OPTIONS': {
'options': '-c search_path=schema1,schema2,schema3'
}
}
}
您还需要更改:
db_table = 'cedirData\".\"persons'
致:
作为奖励,您现在可以使用:
manage.py inspectdb > models.py
这是一个很好的特性,这样您就不必手动复制现有的数据库
但是,如果在数据库上大量使用模式名称空间,并且其他应用程序依赖它,那么此解决方案将不会对您有所帮助。另一种方法是编写自定义testrunner,在测试数据库中创建这些模式。这比上述方法要复杂一些,可能会有点混乱。我不建议你这么做,但如果你有兴趣,我可以试着帮你
一种不那么混乱但更“黑客”的方法是在运行测试时简单地覆盖meta。这也是一个testrunner
from django.test.simple import DjangoTestSuiteRunner
from django.db.models.loading import get_models
class SchemaModelTestRunner(DjangoTestSuiteRunner):
"""Docstring"""
def setup_test_environment(self, *args, **kwargs):
self.original_db_tables = {}
self.schema_models = [m for m in get_models()
if '"."' in m._meta.db_table]
for m in self.schema_models:
schema, table = m._meta.db_table.split('"."')
self.original_db_tables[m] = m._meta.db_table
m._meta.db_table = 'schema_'+schema+'_table_'+table
super(SchemaModelTestRunner, self).setup_test_environment(*args,
**kwargs)
def teardown_test_environment(self, *args, **kwargs):
super(SchemaModelTestRunner, self).teardown_test_environment(*args,
**kwargs)
# reset models
for m in self.schema_models:
m._meta.db_table = self.original_db_tables[m]
您还需要将其定义为settings.py文件中的testrunner。settings.py中的“选项”技巧是一个好主意,也是最好的选项
manage.py inspectdb > models.py
from django.test.simple import DjangoTestSuiteRunner
from django.db.models.loading import get_models
class SchemaModelTestRunner(DjangoTestSuiteRunner):
"""Docstring"""
def setup_test_environment(self, *args, **kwargs):
self.original_db_tables = {}
self.schema_models = [m for m in get_models()
if '"."' in m._meta.db_table]
for m in self.schema_models:
schema, table = m._meta.db_table.split('"."')
self.original_db_tables[m] = m._meta.db_table
m._meta.db_table = 'schema_'+schema+'_table_'+table
super(SchemaModelTestRunner, self).setup_test_environment(*args,
**kwargs)
def teardown_test_environment(self, *args, **kwargs):
super(SchemaModelTestRunner, self).teardown_test_environment(*args,
**kwargs)
# reset models
for m in self.schema_models:
m._meta.db_table = self.original_db_tables[m]