Tag model on another Rails - ruby-on-rails

Question

I want to tag my product model on my post model.
post.rb
has_many :taggings
has_many :products, through: :taggings
product.rb
has_many :taggings
has_many :posts, through: :taggings
tagging.rb
belongs_to :post
belongs_to :product
On my post view, I have a product list. I want that when the user clicks on a product, it creates a new product/post link via post method.
What link can I use? How to set up controllers and params?
Thanks for the help

Answer 1

If you want to let the user create multiple taggings at once you can just add a select / checkbox to the forms for a post.
<%= form_for(#post) do |f| %>
# ...
<div class="field">
<%= f.label :product_ids %>
<%= f.collection_select :product_ids, Product.all, :name, :id %>
</div>
<% end %>
def post_params
params.require(:post)
.permit(:foo, :bar, product_ids: [])
end
Rails will automatically create the records in the join table.
If you want the user to create the linkings one by one you need to setup a nested route:
Rails.application.routes.draw do
# ...
resources :posts do
resources :taggings, only: :create
end
end
You then need to setup a form for each product on the posts/show.html.erb page:
<ul>
<% #post.products.each do |product| %>
<li>
<%= product.name %>
<%= form_for [#post, product.taggings.new] do |f| %>
<%= f.hidden_field :product_id %>
<%= f.submit 'tag' %>
<% end %>
</li>
<% end %>
</ul>
You can pretty this up later with CSS/JS.
And a controller to handle creating the taggings.
class TaggingsController < ApplicationController
# POST /posts/:post_id/taggings
def create
#post = Post.find(params[:post_id])
#tagging = #post.taggings.new(product: Product.find(params[:tagging][:product_id]))
if #tagging.save
redirect_to #product, success: 'Tagging saved.'
else
redirect_to #product, error: 'Tagging not saved.'
end
end
end