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Forum Series Part 3: Nested Attributes and fields_for Discussion
What do you think about using ActiveForm? https://github.com/rails/ac...
This looks awesome. I'd love to see this stuff standardized and included in Rails core. Is the plan for this shipping with Rails 5?
Also there is a gem `reform` for helping with this is https://github.com/apotonic...
What markdown parser gem did you use for this episode Chris?
I'm using pygments.rb inside of Github's html-pipeline with a handful of other gems to improve the Markdown parsing:
gem "html-pipeline", "~> 1.9.0"
gem "rinku", "~> 1.7.3"
gem 'github-linguist', '~> 3.1.2'
gem "github-markdown", "~> 0.6.4"
gem 'pygments.rb', '~> 0.6.0'
You flew by the form pretty fast. Can you include that code on this page as well. I don't have the view files, so create them manually? Thanks!
I just updated the notes to include the link to the Github project but it's here too! https://github.com/excid3/g...
I'm very new at this, so I have a few questions.
How come my forum_threads_controller was blank, but the video started with some code already?
Also, my views folder has none of the same files that the video has at this point? Are will we be creating these as we go?
I skipped a few of those pieces to focus on the topic in this episode. The controller and views are basically just those you get from generating a scaffold.
In the future, I'll be sure to include the code for you in between.
I have tried this but seem to have a problem.
When I do:
@post = Post.new
I get a undefined method 'build' for nil:class
but it will work if I do this:
@post = Post.new
has_one: :content, dependent: :destroy
Any ideas why?
has_one and has_many are different and you'll interact with them differently.
has_one :content makes methods like @post.build_content and @post.create_content
has_many :contents makes methods like @post.contents.build and @post.contents.create
Much more information here: http://api.rubyonrails.org/...
Hi Chris, How can I make it create x amount of posts, specified by the thread starter, each with a different subject, again specified by the thread starter. For example:
New thread Name= Cars
Is there an easier way to do this? what i basically want is kind of a thread within a thread
Hi Chris! I'd like to create a form for a product model, where users can choose a product category first and then can fill the form out. This would be easy, but I'd like to show them different attributes based on the chosen category. Something like if they choose book category, then they will have fields like title, author, published_at, but if they choose shoes category then they can fill out the size, color and type fields. What is the good approach in this case? Should I create more different models like (shoes,books, etc.) or something else? I saw some tuts about dynamic form, but as far as I understand it, I don't need that since the form fields will be predefined and users won't be able to add extra fields.
Hi Chris, great videos! What are your thoughts about using simple_form gem instead of the built in form_for helper? Are there any advantages/disadvantages using this gem?
Simple from gem: https://github.com/platafor...
Pros are you get a lot of helpers for making basic forms quicker, downside is that I often customize my forms a lot so you can't really use their helpers all the time and it's also another API to continuously memorize. I use them in things like Admin areas or forms that don't need much UI work, but other than that, I tend to just use the normal form helpers and tags.
This episode was hard to follow because there was a lot added that wasn't covered on video.
If someone is using Rails 5, notice that "the relational model MUST need the foreign key to create the instance", because the forum_thread has not created yet, the foreign key in forum_post is missing.
In Rails 5, need to add ', optional: true' to forum_post.rb
'belongs_to :forum_thread' >>> 'belongs_to :forum_thread, optional: true'
My afternoon has been spent without this information and it was a confusing afternoon. This is exactly what I needed to know. THANK YOU :)
Thank you :)
class ForumThreadsController <ApplicationController
before_action :authenticate_user!, except: [:index,:show]
before_action :set_forum_thread,except: [:index,:new,:create]
@forum_threads = ForumThread.all
@forum_thread = ForumThread.new
@forum_thread = current_user.forum_threads.new forum_thread_params
render action: :new
@forum_thread = ForumThread.find(params[:id])
class ForumPostController < ApplicationController
@forum_posts = @ForumPost.all
@forum_post = @ForumPost.new
<%= form_with model: @forum_thread do |form| %>
<%= form.text_field :subject, palceholder: "subject", class: "form-control" %>
<%= form.fields_for :forum_posts do |p| %>
<%= p.text_area :body ,palceholder: " Add a coment", rows: 5, class: " form-control" %>
<% end %>
<% end %>
<%= render 'forum_threads/form' %>
unknown attribute 'forum_thread_id' for ForumPost.