Facebook Like/Unlike gives error message - ios

Question

I am building an application which implements Facebook. Through this application I can like and comment on a post. I am fetching Home feeds for the logged in user. Now for Like operation I am using the graph API :
https://graph.facebook.com/POST_ID/likes?&access_token=ACCESS_TOKEN
with HTTPMethod: POST
Here, the POST_ID is the ID I am getting for each feed and the access token of the logged in user.
Now in most of the cases I can like the feed using this API. But some posts don't have Like Connections. How do I know which feed has a like connection & which does not.
Now coming to Unlike. For Unlike operation I am using the graph API :
https://graph.facebook.com/POST_ID/likes?&access_token=ACCESS_TOKEN
with HTTPMethod: DELETE
I can unlike some posts or feeds using this API. But for some I get an error message. In that case i am using for example:
This is the
POST_ID = 12345_67890. When I get error message for this I am using the 67890 as the POST_ID in this case & I am getting success to unlike a post/feed.
Again in using this 67890 as POST_ID gives error in some cases & in that case I am using OBJECT_ID if exists in the feed I am receiving. And I am getting true response in some cases.
But in rest of the cases I can't find any solution for Like & Unlike of a feed/post in Facebook.
Waiting for positive reply.

Answer 1

if you are using correct post_id of feed than it will never produce any error while liking/disliking post on facebook by following code
if do you want to like than change HTTPMethod to POST otherwise set DELETE for dislike. there is no need of accesstoken to call this api.if you are using so it will not produce any error
[FBRequestConnection startWithGraphPath:[NSString stringWithFormat:#"%#/likes",#"Post_id"] parameters:nil HTTPMethod:#"DELETE" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (error)
{
NSLog(#"error: %#", error.localizedDescription);
}
else
{
NSLog(#"ok!! %#",result);
}
}];