What would be the best way to implement to check if the Post has been liked by the User using JPA and MySQL?

What would be the best way to implement to check if the Post has been liked by the User using JPA and MySQL?

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What would be the best way to implement to check if the Post has been liked by the User using JPA and MySQL?
Tag : java , By : Ben Kohn
Date : November 28 2020, 11:01 PM

this one helps. you could try to extract the liked posts from the list of posts you've just got before. with a "SELECT ... IN" request) and then fill the boolean isLiked; something like :

public List<PostMW> getFeed(int page, UserMW user) {
    List<PostMW> result;
    int offset = page * ConstUtil.FEED_POSTS_PER_PAGE;
    result = postDao.list(offset, ConstUtil.FEED_POSTS_PER_PAGE);

    List<Long> postIds = new ArrayList();

    for(PostMW post : result){           

   //then EXtract all liked post from list :
   Query queryIn = em.createQuery("SELECT p.post.id FROM LikeMW p WHERE p.user = :user AND p.post IN :values");

   queryIn.setParameter("values", postIds );
   queryIn.setParameter("user", currentUser);
   List<Object[]> resultIn = queryIn.getResultList();

   Set<Long> postIdLiked ) new HashSet<>();
   for(Object[] row: resultIn) {
   //then fill the boolean isLiked  
   for(PostMW post : result){            
       if (postIdLiked.contains(post.getId()) 

    return result;


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How to check if a user is edting a table record before allowing another user to edit, not wait for post?

Tag : php , By : Debashree
Date : March 29 2020, 07:55 AM
wish help you to fix your issue There are many system-level approaches you could use to handle the problem. Locking a record for exclusive editing is only one, traditionally chosen by older systems.
A more modern methodology is to allow both edits to proceed without locking—termed optimistic concurrency control. If there is an overlapping edit, see if it can be resolved automatically—many simultaneous edits are, in fact, not contentious, especially if they edit unrelated parts of the record.

facebook api fql stream, how to check if its page post or user post?

Tag : php , By : Trevor Cortez
Date : March 29 2020, 07:55 AM
will be helpful for those in need You'll need to query the profile table to get this.
SELECT id, type FROM profile WHERE id IN (SELECT actor_id FROM #STREAM_QUERY)

Mysql select query for getting current user post and followed friend post

Tag : mysql , By : Philofax
Date : March 29 2020, 07:55 AM
To fix this issue First it is recommended to use explicit JOINS over implicit CROSS JOIN
Try the following query.
    users AS U  
    follow_user AS F
 ON U.userID = F.userId1    
    post AS T
 ON T.pUserID = U.userID OR T.pUserID = F.userId2 
    U.userID = '$uid' //$uid holds the id of the current logged in user
    order by T.postID DESC;

How to implement delete of your post and not other user post in Rails

Tag : ruby-on-rails , By : MikeW
Date : March 29 2020, 07:55 AM
wish helps you Lets say you have a Post model and views all set up:
In your views/posts/show you can set up something like this:
<% if @post.user.id == current_user.id %>
  <%= link_to "Edit", edit_post_path(@post), class:"btn btn-success btn-sm" %>
<% end %>
<% if user_signed_in? %>
  <% if @post.user.id == current_user.id %>
    <%= render 'form', tutorial: @post %>
  <% end %>
<% else %>
  <h1>stop trying to edit others post</h1>
<% end %>

Check if user can comment in a post if he has that post registered

Tag : ruby-on-rails , By : Manu
Date : March 29 2020, 07:55 AM
wish helps you How can i validate if an user belongs to the post he's watching if not dont allow to comment on the post, i tried with if and im using a has_many model like User(devise) UserPost(model) Post and comments(belongs_to post) , playing with the code I tried this and it worked:
  <%if current_user.courses.exists?(@course.id)%>
    do ....
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