Re: [Rails] Need help fixing an error populating a select box in the insert page but works in the editpage

[Colin Law]

On 17 November 2012 17:26, Ruby Rooikie <rubyr...@gmail.com> wrote:
> Two Models Country and Bank. The below form is used for insert and edit page
> works fine . f.collection_select works fine for edit page but throws error
> for insert page. I think error it is trying to populate the selected value
> in the combo box but country id is not available. Can you help me fixing the
> issue? What is prompt used for?
>
>
>
>
> Error
>
> undefined method `map' for nil:NilClass
>
> Extracted source (around line #23):
>
> 20: <%= f.label :country_id %><br />
> 21:
> 22:
> 23: <%= f.collection_select :country_id, @countries, :id, :name,
> :prompt => "Test" %>

My guess is that @countries is nil (the clue is in the error
message). Are you setting that up in the controller action for
insert?

Colin

> 24:
> 25: <div class="actions">
> 26: <%= f.submit %>
>
> class Bank < ActiveRecord::Base
> attr_accessible :name,:country_id
> belongs_to :country
> validates :name, :presence => true
>
> validates_presence_of :country
> end
>
>
> class Country < ActiveRecord::Base
> attr_accessible :name
> end
>
> Form
>
>
>
> <%= form_for(@bank) do |f| %>
> <% if @bank.errors.any? %>
> <div id="error_explanation">
> <h2><%= pluralize(@bank.errors.count, "error") %> prohibited this bank
> from being saved:</h2>
>
> <ul>
> <% @bank.errors.full_messages.each do |msg| %>
> <li><%= msg %></li>
> <% end %>
> </ul>
> </div>
> <% end %>
>
> <div class="field">
> <%= f.label :name %><br />
> <%= f.text_field :name %>
> </div>
>
> <div class="field">
> <%= f.label :country_id %><br />
>
>
> <%= f.collection_select :country_id, @countries, :id, :name, :prompt =>
> "Test" %>
>
>
> <div class="actions">
> <%= f.submit %>
> </div>
> <% end %>
>
>
>
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[rubyrookie]

Yes I am setting it up. i got it to work. :) Thanks

On Saturday, November 17, 2012 9:26:54 AM UTC-8, Ruby Rooikie wrote:

Two Models Country and Bank. The below form is used for insert and edit page works fine .  f.collection_select works fine for edit page but throws error for insert page. I think error it is trying to populate the selected value in the combo box but country id is not available. Can you help me fixing the issue? What is prompt used for?

Error

undefined method `map' for nil:NilClass

Extracted source (around line #23):

20:     <%= f.label :country_id %><br />
21:    
22:      
23:      <%= f.collection_select :country_id, @countries, :id, :name, :prompt => "Test" %>
24:   
25:   <div class="actions">
26:     <%= f.submit %>

[rubyrookie]

Thanks I have it working now.