Implement a user comment in Rails -

since i'm new in ruby on rails i'm kinda confused syntaxes on making user comments under users posts, associations are:

class user < activerecord::base   has_many :comments    has_many :posts  end  class post < activerecord::base   has_many :comments   belongs_to :user end  class comments < activerecord::base   belongs_to :post   belongs_to :user end 

im able make users post using @post = current_user.posts.build(postparams)

i have user_id in comments db. i'am confuse on how make comment belongs_to user comments_controller

def create   @comment = @post.comments.create(comment_params)   redirect_to post_path(@post) end 

if run above code makes comment under post doesn't belong user.

if schema right, should work in comments_controller:

def comment_params   params.require(:comment).permit(:name, :body)                           .merge(user_id: current_user.id) end 

simply merge current user id in comment params, , not need hack user_id in form hidden field. potential security issue.