Rails use collection_select to assign equipment to site - ruby-on-rails

Question

I have a very simple rails application that collects "equipment" and assigns it to a "site"
class CreateEquipment < ActiveRecord::Migration[5.0]
def change
create_table :equipment do |t|
t.string :site_name
t.string :equip_name
t.string :equip_model
t.string :equip_make
t.string :equip_type
t.belongs_to :site
t.timestamps
end
end
end
class CreateSites < ActiveRecord::Migration[5.0]
def change
create_table :sites do |t|
t.string :site_name
t.timestamps
end
end
end
Two models "Equipment" and "Site"
class Equipment < ApplicationRecord
end
class Site < ApplicationRecord
has_many :equipment
end
I have set up the equipment belongs_to Site and site has_many Equipment.
In my equipment form I have a collection_select to choose the site to assign the equipment too.
<div class="field">
<%= f.label :site_name %>
<%= f.collection_select :site_name, Site.all, :site_name, :site_name, prompt: true %>
</div>
<div class="field">
<%= f.label :equip_name %>
<%= f.text_field :equip_name %>
</div>
<div class="field">
<%= f.label :equip_model %>
<%= f.text_field :equip_model %>
</div>
<div class="field">
<%= f.label :equip_make %>
<%= f.text_field :equip_make %>
</div>
<div class="field">
<%= f.label :equip_type %>
<%= f.text_field :equip_type %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
and on the site show page, I have begun to set up the page to show equipment.
<p>
<strong>Sitename:</strong>
<%= #site.site_name %>
</p>
<% #site.equipment.each do |equipment| %>
<p><%= equipment.equip_name %></p>
<% end %>
but I cannot see any equipment when I open the site show page.
I am not getting any faults or issues on the form or the page, I have allowed all params. I think I may have set up my collection_select incorrectly.
Update: Watching Michael Hartl's Ruby on Rails Tutorial Section 14.1.2 User/relationship associations and feel some enlightenment that anyone with this issue should get privy too.

Answer 1

Well I have learned alot over the time I have been playing with rails. Hopefully when a newbie finds this they will see the very simple error I made.
I didnt add the association to the site
class Equipment < ApplicationRecord
end
class Site < ApplicationRecord
has_many :equipment
end
should be
class Equipment < ApplicationRecord
belongs_to :site
end
class Site < ApplicationRecord
has_many :equipment
end
and the table should change from
class CreateEquipment < ActiveRecord::Migration[5.0]
def change
create_table :equipment do |t|
t.string :site_name
t.string :equip_name
t.string :equip_model
t.string :equip_make
t.string :equip_type
t.belongs_to :site
t.timestamps
end
end
end
class CreateEquipment < ActiveRecord::Migration[5.0]
def change
create_table :equipment do |t|
t.string :equip_name
t.string :equip_model
t.string :equip_make
t.string :equip_type
t.references :site
t.timestamps
end
end
end
I hope that helps someone :)