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
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