Rails 7.1: advanced patterns with `before_action` callbacks and nested resources
I can't seem to get I've been researching this but I'm working on a personal project and I'm working on a project and hit a roadblock... I'm working with an scenario with `before_action` callbacks in my Rails 7.1 application when dealing with nested resources. I have a `PostsController` with a nested `CommentsController`, and I'm trying to set a common variable for the `comment` in the `CommentsController`. However, the callback runs multiple times leading to the wrong comment being set in the instance variable. Here's what I have in my `CommentsController`: ```ruby class CommentsController < ApplicationController before_action :set_post before_action :set_comment def create @comment = @post.comments.new(comment_params) if @comment.save redirect_to @post, notice: 'Comment was successfully created.' else render :new end end private def set_post @post = Post.find(params[:post_id]) end def set_comment @comment = Comment.find(params[:id]) if params[:id] end def comment_params params.require(:comment).permit(:content) end end ``` The scenario arises when I try to create a comment with `params[:id]` not being present. In that case, I expect `@comment` to be `nil`, but I get an behavior saying `Couldn't find Comment with 'id'=`. I added some logging in the `set_comment` method to see what `params[:id]` contains, but it seems that the callback is being executed twice in some cases. I've tried adding a condition to the `before_action` like this: ```ruby before_action :set_comment, if: -> { params[:id].present? } ``` But this doesn't seem to resolve the scenario, as it still ends up being called unexpectedly. Is there a better way to manage this situation with nested resources? How can I ensure that `set_comment` only runs when it's actually needed? Any insights would be greatly appreciated. My development environment is Ubuntu. Any help would be greatly appreciated! I'd really appreciate any guidance on this. Any ideas what could be causing this? My team is using Ruby for this application. My development environment is Windows 10.