Micropost's comments on users page (Ruby on Rails)

Question

On user\'s page i have many microposts and i want to add comment form and comments to each micropost.

I have three models: User, Micropost, Comment.

Answer 1

Try passing in the current micropost to the comment partial

<%= render 'shared/comment_form', micropost: micropost %>

Then add the micropost to the comment form_for call

<%= form_for([micropost, @comment]) do |f| %>

Make sure your routes are nested

# in routes.rb
resources :microposts do
  resources :comments
end

Then build the comment off of the micropost in the CommentsController

def create
  @micropost = Micropost.find(params[:micropost_id])
  @comment = @micropost.comments.build(params[:comment])
  ...
end

Answer 2

I would use nested resources for micropost and comments like this in your routes.rb file:

resources :microposts do
  resources :comments
end

Then in your comments controller, which you access through the micropost_comments_path(@micropost) url helper you can do the following to build the association in the create action:

def create
  @micropost = Micropost.find(params[:micropost_id])
  @comment = Comment.new(params[:comment])
  @comment.micropost = @micropost
  @comment.user = current_user

  if @comment.save
    ...
end

You could reduce the number of lines of code using the merge method, but I find that this sometimes reduces the readability of your code, and since you'll need the @micropost object if redisplaying the form after validation errors you may as well just fetch the record.