Can't save data from collection_select helper to model - ruby-on-rails

Question

I'm trying to save an organization to a contact model via a form using a collection_select helper but it's not saving the data to a model. I can't seem to understand why.
I am using Rails 5.1.4
Here are my contact.rb model:
class Contact < ApplicationRecord
belongs_to :organization
has_many :deals
end
Here is my organization.rb model:
class Organization < ApplicationRecord
has_many :deals, through: :contacts
has_many :contacts, dependent: :destroy
end
Here is my schema.rb:
create_table "contacts", force: :cascade do |t|
t.string "contact_name"
t.integer "organization_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["organization_id"], name:
"index_contacts_on_organization_id"
end
create_table "organizations", force: :cascade do |t|
t.string "org_name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
Here is my contacts_controller.rb:
def new
#contact = Contact.new
end
def edit
#contact = Contact.find(params[:id])
end
def create
#contact = Contact.new(contact_params)
if #contact.save
redirect_to #contact
else
render 'new'
end
end
private
def contact_params
params.require(:contact).permit(:contact_name, :organization_id,
organizations_attributes: [:org_name,
:id])
end
Here is my new.html.erb file:
<h1>New Contact</h1>
<%= form_with scope: :contact, url: contacts_path, local: true do |form| %>
<p>
<%= form.label :contact_name %><br>
<%= form.text_field :contact_name %>
</p>
<p>
<%= form.label :organization %><br>
<%= form.collection_select(:organization_id, Organization.all, :id, :org_name) %>
</p>
<p>
<%= form.submit %>
</p>
<% end %>
<hr>
Edit: I added params for my controller and schema.

Answer 1

In organization.rb model:
class Organization < ApplicationRecord
has_many :deals, through: :contacts
has_many :contacts, dependent: :destroy
def org_name
"#{name}"
end
end
in your new.html.erb file:
<%= form.fields_for :organizations do |o| %>
<%= o.collection_select(:organization_id, Organization.all,
:id, :org_name,
{:prompt => 'Please select the organization'}) %>