collection_select is not creating the association table - ruby-on-rails

Question

I'm currently trying to add a collection_select of ranches to my staff
And I saw that it's better to create an extra table to make this association.
And I follow some tutorial, but is not working on my side
This is my code :
Staffs/_form :
<%= form_for(#staff) do |f| %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<%= fields_for(#staff_ranch) do |x| %>
<div class="field">
<%= x.collection_select(:ranch_id, #all_ranch, :id, :name, { }, {:multiple => true}) %>
</div>
<%end%>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
My models :
- Ranch :
has_many :ranchstaffs
has_many :staffs, :through => :ranchstaffs
- Staff :
has_many :ranchstaffs
has_many :ranches, :through => :ranchstaffs
-Ranchstaff :
belongs_to :ranch
belongs_to :staff
Staff controller :
class StaffsController < ApplicationController
before_action :set_staff, only: [:show, :edit, :update, :destroy]
# GET /ranches
# GET /ranches.json
def index
#staffs = current_user.staffs
end
# GET /ranches/1
# GET /ranches/1.json
def show
end
# GET /ranches/new
def new
#staff = Staff.new
#all_ranch = current_user.ranches
#staff_ranch = #staff.ranchstaffs.build
end
# GET /ranches/1/edit
def edit
end
# POST /ranches
# POST /ranches.json
def create
#staff = Staff.new(staff_params)
#staff.update(user_id: current_user.id)
respond_to do |format|
if #staff.save
format.html { redirect_to #staff, notice: 'Staff was successfully created.' }
format.json { render :show, status: :created, location: #staff }
else
format.html { render :new }
format.json { render json: #staff.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /ranches/1
# PATCH/PUT /ranches/1.json
def update
respond_to do |format|
if #staff.update(staff_params)
format.html { redirect_to #staff, notice: 'Staff was successfully updated.' }
format.json { render :show, status: :ok, location: #staff }
else
format.html { render :edit }
format.json { render json: #staff.errors, status: :unprocessable_entity }
end
end
end
# DELETE /ranches/1
# DELETE /ranches/1.json
def destroy
#staff.destroy
respond_to do |format|
format.html { redirect_to staffs_url, notice: 'Ranch was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_staff
#staff = Staff.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def staff_params
params.require(:staff).permit(:name, :user_id, :cat, :ranch_id)
end
end
Can you explain me why the model ranchstaff was not created after a creation of a new staff ?

Answer 1

As you are using fields_for you are using nested form but you are not permitting the parameters properly. First make change in your form:
<%= f.fields_for(#staff_ranch) do |x| %>
<div class="field">
<%= x.collection_select(:ranch_id, #all_ranch, :id, :name, { }, {:multiple => true}) %>
</div>
<% end %>
And then in your controller:
def staff_params
params.require(:staff).permit(:name, :user_id, :cat, ranchstaff_attributes: [ranch_id: []])
end
And in your Staff model write:
accepts_nested_attributes_for :ranchstaffs
Then your ranchstaff should be created when the User is being created.

Answer 2

Your ranch_id is coming in an array. So u have to specify that ranch_id would be array in strong parameters.
so your staff_params method would look like this
def staff_params
params.require(:staff).permit(:name, :user_id, :cat, :staff_ranch_attributes =>[:ranch_id => []])
end