如何使用python flask和mongoalchemy显示对象数组 [英] How to display an array of objects using python flask and mongoalchemy
问题描述
如何编写一个端点,它将为mongoalchemy返回一个json对象数组
How to write an end point which will return a array of json objects for mongoalchemy
我正在尝试如下所示:
@authenticate_bp.route('/users',methods=['GET'])
def user_list():
users = [x.serialize for x in TokenBasedAuth.query.all()]
return jsonify({'usersList': users})
模式如下所示
class TokenBasedAuth(db.Document):
username = db.StringField()
password = db.StringField()
email = db.StringField()
firstName = db.StringField()
lastName = db.StringField()
def serialize(g):
return {
"_id" : str(g._id),
"username" : g.username,
"firstName" : g.firstName,
"lastName" : g.lastName,
"password" : g.password,
"email" : g.email
}
并将db i中的数据作为sho wn under
and the data in db i as shown below
{
"_id" : ObjectId("586a0f01558b6728388161be"),
"username" : "sam",
"firstName" : "sam",
"lastName" : "123",
"password" : "123",
"email" : "email@123"
}
我收到如下所示的错误
AttributeError: TokenBasedAuth对象没有属性 serialize // Werkzeug调试器
AttributeError: 'TokenBasedAuth' object has no attribute 'serialize' // Werkzeug Debugger
按预期工作的替代路由如下所示以下
Alternate route which is working as expected is as shown below
@authenticate_bp.route('/users/list')
def users_listItr():
try:
users = TokenBasedAuth.query.all()
formatted_users=[]
for user in users:
print user
formatted_users.append({
'username':user.username,
'password':user.password,
'email':user.email,
'firstName':user.firstName,
'lastName':user.lastName
})
return json.dumps({'users':formatted_users}),
200,{'Content-Type':'application/json'}
except Exception,e:
return jsonify(status='ERROR',message=str(e))
但这不是一个好主意,因为我正在尝试为可能包含数千个结构更复杂的文档的模式构建api,请提出一种解决方法
But this is not a good idea as i am trying built the api for a schema which might contain few thousand documents with much more complex structure please suggest a way to go about it please
请帮助获取对象数组
推荐答案
我认为最简单的方法是在结果集上使用带有函数的生成器,以将结果对象序列化为有效的JSON:
The easiest way in my opinion is to use a generator on the result set with a function to serialize the result object to valid JSON:
def serialize(row):
return {
"_id" : str(row._id),
"username" : row.username,
"firstName" : row.firstName,
"lastName" : row.lastName,
"password" : row.password,
"email" : row.email
}
@authenticate_bp.route('/users',methods=['GET'])
def user_list():
users = [serialize(x) for x in TokenBasedAuth.query.all()]
return jsonify({'usersList': users})
有几种方法可以尝试创建自定义JSON编码器:请参阅这篇文章。一般来说,对于Flask,我发现,如果我需要对某些东西进行JSON化,那么我需要坚持使用列表和字典,因为这要简单得多。
There are some ways you can try to create a custom JSON encoder: See this post. Generally speaking I've found, for Flask, if I need to JSONify something I need to stick to lists and dicts as it is much simpler.
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