我创建了一个简单的 eve-sqlalchemy
应用程序,它具有 User
和 Role
资源,以模仿 an example on their webpage 。 User
类可以具有多个角色。下面提供了完整的示例代码。
我希望能够POST
具有角色的用户,或PATCH
用户的角色。我一直无法找到一种方法来做到这一点而不遇到错误。
看起来eve-sqlalchemy
将User.roles
的类型强制为整数,这是Role
类的主键 id
。如果我将 POST
或 PATCH
请求设置为使 roles
字段为整数,eve-sqlalchemy
会提示self.driver.app.config['SOURCES']
中不存在 userroles
关联表。虽然我可以进行这些更改(即将 userroles
表设为声明性 ORM 并将其注册到装饰器),但我不确定这是否是正确的方法。
总而言之,eve-sqlalchemy
希望我如何POST
具有角色
列表的用户
,或PATCH
用户的现有角色?
服务器:
from eve import Eve
from eve.utils import config
from sqlalchemy import create_engine, Table, Column, String, Integer, ForeignKey, func, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, sessionmaker
from eve_sqlalchemy.decorators import registerSchema
from eve_sqlalchemy import SQL
from eve_sqlalchemy.validation import ValidatorSQL
ID_FIELD = 'id'
SQLALCHEMY_DATABASE_URI = 'sqlite:////tmp/eve-sqla-test.db'
config.ID_FIELD = ID_FIELD
config.ITEM_LOOKUP_FIELD = ID_FIELD
Base = declarative_base()
userroles_table = Table('userroles', Base.metadata,
Column('user_id', Integer, ForeignKey("users.id"), primary_key=True),
Column('role_id', Integer, ForeignKey("roles.id"), primary_key=True)
)
class CommonColumns(Base):
__abstract__ = True
_created = Column(DateTime, default=func.now())
_updated = Column(DateTime, default=func.now(), onupdate=func.now())
_etag = Column(String(40))
class Role(CommonColumns):
__tablename__ = 'roles'
id = Column(Integer, primary_key=True, autoincrement=True)
role = Column(String, unique=True, nullable=False)
class User(CommonColumns):
__tablename__ = 'users'
id = Column(Integer, primary_key=True, autoincrement=True)
login = Column(String, unique=True, nullable=False)
roles = relationship("Role", backref="users", secondary=userroles_table)
def create_entries():
'''Creates test entries for querying with eve'''
engine = create_engine(SQLALCHEMY_DATABASE_URI)
Base.metadata.bind = engine
Base.metadata.create_all()
SessionMaker = sessionmaker(bind=engine)
s = SessionMaker()
u1 = User(login='user1')
u1.roles.append(Role(role='admin'))
u2 = User(login='user2')
u2.roles.append(Role(role='user'))
s.add_all((u1, u2))
s.commit()
def run():
'''Runs the eve server'''
for table in (User, Role):
registerSchema(table.__tablename__)(table)
users = User._eve_schema[User.__tablename__]
users.update({
'item_methods': ['GET', 'PATCH', 'DELETE'],
'resource_methods': ['GET', 'POST'],
})
roles = Role._eve_schema[Role.__tablename__]
roles.update({
'resource_methods': ['GET', 'POST'],
})
DOMAIN = {
'users': users,
'roles': roles,
}
SETTINGS = {
'SQLALCHEMY_DATABASE_URI': SQLALCHEMY_DATABASE_URI,
'SQLALCHEMY_TRACK_MODIFICATIONS': False,
'ID_FIELD': ID_FIELD,
'ITEM_LOOKUP_FIELD': ID_FIELD,
'DOMAIN': DOMAIN,
}
app = Eve(validator=ValidatorSQL, data=SQL, settings=SETTINGS)
db = app.data.driver
Base.metadata.bind = db.engine
db.Model = Base
app.run(debug=True)
if __name__ == '__main__':
'''Test area'''
#create_entries()
run()
请求:
import json
import requests
u4 = {
'login': 'user4',
}
# users get works
r = requests.get('http://localhost:5000/users')
print(r.text)
# user creation works
r = requests.post('http://localhost:5000/users', json=u4)
print(r.text)
# roles get works
r = requests.get('http://localhost:5000/roles')
print(r.text)
# user creation with roles fail
u5 = {
'login': 'user5',
'roles': [1,]
}
r = requests.post('http://localhost:5000/users', json=u5)
print(r.text) # {"_issues": {"roles": ["field 'roles' could not be coerced", "must be of integer type"]}, "_status": "ERR"}
# user patch with role fails
r = requests.get('http://localhost:5000/users/1')
patch_headers = {"If-Match": r.json()['_etag'], 'Content-type': 'application/json; charset=utf-8'}
r = requests.patch('http://localhost:5000/users/1', headers=patch_headers, json={'roles': [1,]})
print(r.text) # {"_issues": {"roles": ["field 'roles' could not be coerced", "must be of integer type"]}, "_status": "ERR"}
最佳答案
我最终做的是:
- 将
userroles_table
从表转换为声明性类UserRole
。 - 使用
eve_sqlalchemy
注册UserRole
- 将
UserRole
添加到DOMAIN
。
然后可以通过新的资源端点user_roles
直接查询或修改关联表。 eve_sqlalchemy
似乎在生成架构时隐藏了外键,因此包含与外键的关系非常重要。
关于python - 如何使用 eve-sqlalchemy 更新项目关系,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42373208/