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.
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