问题
I'm migrating from Parse to Firebase.
My sendRequest function does the following tasks (Assume user1 sends request to user2) -Check if the username exists -Check if user1 has not already sent a request to user2 -Check if user1 and user2 are not already friends
Once these are done user2 receives a pushNotification and the respective fields are updated.
How would I do this on firebase considering the following structure? Would it have something to do with firebase-rules?
Users
290384239843
friends:
093824098209384: true
username: Bob
Usernames
Bob: 290384239843
Jack: 5842258855552
Carol: 093824098209384
PendingFriends
290384239843 true
list:
093824098209384: pending
Parse Cloud Code
Parse.Cloud.define("sendRequest",function(request, response)
{
// Username 1 = CurrentUser
// Username 2 = FriendUser
var username1 = request.params.username1;
var username2 = request.params.username2;
var user1 = request.params.user1;
var p1 = Parse.User.createWithoutData(user1);
var list = [];
list[0] = username1;
list[1] = username2;
//NEW
var realname1 = request.params.realname1;
var usercolor1 = request.params.usercolor1;
var query1 = new Parse.Query(Parse.User);
query1.equalTo("username", username2);
query1.first(
{
success: function(object1)
{
//Yes "username2" exists
if(object1 != null)
{
var user2 = object1.id;
var p2 = object1;
//NEW
var realname2 = p2.get("realName");
var query2 = new Parse.Query("PendingFriends");
query2.containsAll("bothUsernames",list);
query2.descending("createdAt");
query2.first(
{
success: function(object2)
{
if(object2 != null)
{
var isDeleted = object2.get("isDeleted");
var isAccepted = object2.get("isAccepted");
var isUnfriend = object2.get("isUnfriend");
if( (isDeleted==true) || (isAccepted==true && isUnfriend==true) )
{
var FriendRequests = Parse.Object.extend("PendingFriends");
var fRequests = new FriendRequests();
fRequests.set("usernameFrom", username1);
fRequests.set("userFrom", p1);
fRequests.set("usernameTo", username2);
fRequests.set("userTo", p2);
fRequests.set("bothUsernames",list);
//NEW
fRequests.set("realnameFrom",realname1);
fRequests.set("realnameTo", realname2);
fRequests.save(null,
{
success: function(fRequests)
{
//----
var pQuery = new Parse.Query(Parse.Installation);
pQuery.equalTo('username', username2);
Parse.Push.send(
{
where: pQuery,
data:
{
//alert: "You've got a friend request from " + realname1,
request_message: "You've got a friend request from " + realname1,
request_username: username1,
request_realname: realname1,
request_statuscolor: usercolor1,
action: "com.app.REQUEST_RECEIVE"
}
},
{
success: function()
{
// Push was successful
response.success("Object 2 is NOT_NULL & SAVED");
},
error: function(pError)
{
// Handle error
response.error("Error(pError;O2!=Null): " + pError.code + " " + pError.message);
}
});
//----
},
error: function(fRequests, errorSave)
{
response.error("Error(errorSave;O2!=null): " + errorSave.code + " " + errorSave.message);
}
});
}else
{
response.success("Object 2 is NOT_SAVING");
}
}else
{
var FriendRequests = Parse.Object.extend("PendingFriends");
var fRequests = new FriendRequests();
fRequests.set("usernameFrom", username1);
fRequests.set("userFrom", p1);
fRequests.set("usernameTo", username2);
fRequests.set("userTo", p2);
fRequests.set("bothUsernames",list);
//NEW
fRequests.set("realnameFrom",realname1);
fRequests.set("realnameTo", realname2);
fRequests.save(null,
{
success: function(fRequests)
{
//----
var pQuery = new Parse.Query(Parse.Installation);
pQuery.equalTo('username', username2);
Parse.Push.send(
{
where: pQuery,
data:
{
//alert: "You've got a friend request from " + username1,
//action: "com.app.REFRESHREQUESTS"
request_message: "You've got a friend request from " + realname1,
request_username: username1,
request_realname: realname1,
request_statuscolor: usercolor1,
action: "com.app.REQUEST_RECEIVE"
}
},
{
success: function()
{
// Push was successful
response.success("Object 2 is NULL & SAVED");
},
error: function(pError)
{
// Handle error
response.error("Error(pError;O2=Null): " + pError.code + " " + pError.message);
}
});
//----
},
error: function(fRequests, errorSave)
{
response.error("Error(errorSave;O2=Null): " + errorSave.code + " " + errorSave.message);
}
});
}
},
error: function(error2)
{
response.error("Error(error2): " + error2.code + " " + error2.message);
}
});
}else
{
response.success("Object 1 is NULL");
}
},
error: function(error1)
{
response.error("error " + error1.message);
}
});
});
Note: I'm choosing to have PendingFriends as a separate tree as firebase downloads the all children nodes when you download the parent node. Which means everytime I download the user details, I would get a list of their friends & pending-friends (which I have tried to avoid).
来源：https://stackoverflow.com/questions/41198113/sending-friend-request-using-firebase-on-android