Question

I am using dict to create a json object but I am having some issue with dict and json!

def get(self):

    players = db.GqlQuery("SELECT * FROM Player")

    playerInfo  = {}



    for player in players:
        email = player.email.encode("utf-8")
        gem =  str(player.gem)

        print email
        print gem

        playerInfo["email"] = email
        playerInfo["gem"] = gem


    b = json.dumps(playerInfo)

    self.response.out.write(b)

For some reason I only received one and the for loop, and when I print email in the for loop I received 6 results but the output of playerInfo only has 1 set of data.

{"email": "test1", "gem": "0"}

My expected result should be

{"email": "test1", "gem": "0"},{"email": "test2", "gem": "2"}...

Answer 1

What you want, I think is a list of dictionaries. That will enable you to store multiple entities:

players = db.GqlQuery("SELECT * FROM Player")

playerInfo  = []

for player in players:
    email = player.email.encode("utf-8")
    gem =  str(player.gem)

    playerInfo.append({"email" :email, "gem": gem})

b = json.dumps(playerInfo)

self.response.out.write(b)

Also, you really want to avoid using print in you AppEngine applications. Use logging instead, as print can have unintended side-effects.