CODEWITHSUNDEEP
ruby-on-railsnested-attributesruby-on-rails-4
Fveloz
Fveloz

Reputation: 13

Rails 4 calling nested associations

I'm pretty new to rails but started having this issue today which i haven't experienced before. Currently working on an application with a few nested associations. While i can create and add save these nested associations through the parent association i can't seem to call on elements from the associated model very well. I can see the information has been saved but when I call for it i get the name of the model not what is in the name column of the table.

brew.rb

    class Brew < ActiveRecord::Base
     has_many :fermentables
     has_many :extras
     has_many :hops
     has_many :yeasts

     accepts_nested_attributes_for :hops

     end

hop.rb

     class Hop < ActiveRecord::Base
        belongs_to :brew
      end

show.html.erb

      <%= @brew.name %>
       <%= @brew.story %>
       <%=  @brew.walkthrough %>
       <%=  @brew.hops.name%>

The show displays mostly everything just fine except when it comes to @brew.hops.name. It only displays Hop. When I go into rails console I can see that the name had been saved. But only when I do something like.

   t = Brew.last
   t.hops.name

results only in the word "hops"

but if i just say

   t.hops

i get

      ` SELECT "hops".* FROM "hops" WHERE "hops"."brew_id" = ?  [["brew_id", 28]]
        => #<ActiveRecord::Associations::CollectionProxy [#<Hop id: 6, name: "Warrior",
        brew_id: 28, created_at: "2013-06-09 22:09:19", updated_at: "2013-06-09    22:09:19">]> `

Upvotes: 1

Views: 328

Answers (2)

Marek Lipka
Marek Lipka

Reputation: 51151

Brew and hops are in relation one-to-many, so @brew.hops returns set of all hops belonging to @brew. So, if you want to display all associated hops names, you should do something like this:

<% @brew.hops.each do |hop| %>
  <%= hop.name %><br />
<% end %>

Upvotes: 1

Stuart M
Stuart M

Reputation: 11588

t.hops returns an object representing the has_many association itself, not an individual Hop record, and calling the name method on that association object gives the name of the class of the associated model (the Hop class).

So I think you are wanting to iterate over the list of associated Hops and print each of their names:

<%- @brew.hops.each do |hop| -%>
  Hop: <%= hop.name %>
<%- end -%>

Upvotes: 0

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