Rodrigo Dominguez wrote:
> Just Dawson wrote:
>> Hello, please forgive me if this answer is obvious! I'm new to Rails
>> this week.
>>
>> I have two database tables, and the associated scaffolding, controllers,
>> models and views. The first is service_provider, which holds a list of
>> service providers. The second is service_provider_countries which is a
>> table of countries (obvious perhaps).
>>
>> In views/service_providers/new.html.erb I have a form, that allows the
>> you to create a new service provider (name, country, description).
>>
>> Which looks like so:
>>
>> <h1>New Service Provider</h1>
>>
>> <% form_for(@service_provider) do |f| %>
>> <%= f.error_messages %>
>> <p>
>> <%= f.label :Name %><br />
>> <%= f.text_field :Name %>
>> </p>
>> <p>
>> <%= f.label :Country %><br />
>> <%= f.text_field :Country %>
>> </p>
>> <p>
>> <%= f.label :Description %><br />
>> <%= f.text_field :Description %>
>> </p>
>> <p>
>> <%= f.submit 'Create' %>
>> </p>
>> <% end %>
>>
>> This works as expected, however, I want to modify the form so it lists
>> all the countries in a select box from the service_provider_countries
>> table.
>>
>> In views/service_provider_countries/index.html.erb I added:
>>
>> <%= select ("CountryISO", "id", @service_provider_countries.map {|u|
>> [u.ISO,u.ISO]}) %>
>>
>> Which works as expected, producing a select box of all the countries.
>>
>> However, when I copy this bit of code and put it into
>> views/service_providers/new.html.erb it does not work, producing the
>> error:
>>
>> You have a nil object when you didn't expect it!
>> You might have expected an instance of Array.
>> The error occurred while evaluating nil.map
>>
>> I understand the error to mean that view/service_providers does not have
>> access to the (controller?model?) service_provider_countries, could you
>> please explain how I might do this? Thank you and apologies for the
>> long-winded post.
>
> the thing is t...@service_provider_countris is a instance variable
> declared in the new action of the ServiceProviderCountries controller
>
> in the new action of the ServiceProviders, you can do
> @service_provider_countries = ServiceProviderCountries.all
>
> and that will do the work you want.
>
> but a better approach could be to do
>
> <%= f.collection_select :service_provider_country_id,
> ServiceProviderCountries.all, :id, :name, :include_blank => 'None' %>
>
> Remember to declare the relationship in the model tables and to create
> the foreing key in the migrations
Thank you for your help,
I modified /controllers/service_providers_controller.rb as follows:
def new
@service_provider = ServiceProvider.new
@service_provider_countries = ServiceProviderCountry.all
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @service_provider }
end
end
This now works as I had hoped. Thank you again.
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