CODEWITHSUNDEEP
ruby-on-rails
rails007
rails007

Reputation: 45

Rails - select tag helper - display two column values

In rails guides

http://guides.rubyonrails.org/form_helpers.html#option-tags-from-a-collection-of-arbitrary-objects

we can show a select box with city name as options using the below 

<%= options_from_collection_for_select(City.all, :id, :name) %>

Now my select box has below options:

I need to display options with city name,country in select box. How can I do this ?

Like this

have country_id in cities table.

Upvotes: 2

Views: 877

Answers (1)

Marek Lipka
Marek Lipka

Reputation: 51151

First, you should implement proper method in City model, for example: name_with_country:

def name_with_country
  "#{name}, #{country.name}"
end

second, you should use this method and include country in your cities query to avoid N + 1 problem:

<%= options_from_collection_for_select(City.includes(:country), :id, :name_with_country) %>

Upvotes: 3

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