collection_select和collection_checked_boxes之间的区别

Question

new.html.erb

 Price:  <%= f.collection_select :price_ids, Price.all, :id,:name,prompt: true %> JD

In the controller :

def dress_attributes
  dress_attributes = params.require(:dress).permit(:name,:email,:phone,:description,:image,:image2,[:price_ids: []})
end

In show.html.erb :

Price: <% @dress.prices.each do |s| %>
         <%= s.name %> 
       <% end %>`

And the price doesn't show.

What's wrong when I change the collection_select to collection_checked_boxes ? It works, but I want the collection_select .

Answer 1

You can pass multiple: true as html_options to collection_select as given below.

new.html.erb

 Price:  <%= f.collection_select :price_id, Price.all, :id,:name, {prompt: true}, {multiple: true} %> JD

In the controller

def dress_attributes
  dress_attributes = params.require(:dress).permit(:name,:email,:phone,:description,:image,:image2,:price_id)
end

Then, in your controller, you can access price_id as params[:dress][:price_id] which will be an array of selected prices.