refactor(champ): simplify dossier link champ

app/controllers/champs/dossier_link_controller.rb

@@ -2,12 +2,7 @@ class Champs::DossierLinkController < ApplicationController
   before_action :authenticate_logged_user!
 
   def show
-    @position = params[:position]
-
-    if params[:dossier].key?(:champs_attributes)
-      @dossier_id = params[:dossier][:champs_attributes][params[:position]][:value]
-    else
-      @dossier_id = params[:dossier][:champs_private_attributes][params[:position]][:value]
-    end
+    @champ = policy_scope(Champ).find(params[:champ_id])
+    @linked_dossier_id = read_param_value(@champ.input_name, 'value')
   end
 end

app/views/champs/dossier_link/show.js.erb

@@ -1,3 +1,3 @@
-<%= render_to_element(".dossier-link-#{@position} .help-block",
+<%= render_to_element("##{@champ.input_group_id} .help-block",
   partial: 'shared/champs/dossier_link/help_block',
-  locals: { id: @dossier_id }) %>
+  locals: { id: @linked_dossier_id }) %>

app/views/shared/dossiers/editable_champs/_dossier_link.html.haml

@@ -1,11 +1,11 @@
-.dossier-link{ class: "dossier-link-#{form.index}" }
+.dossier-link
   = form.number_field :value,
     id: champ.input_id,
     aria: { describedby: champ.describedby_id },
     placeholder: "Numéro de dossier",
     autocomplete: 'off',
     required: champ.mandatory?,
-    data: { remote: true, url: champs_dossier_link_path(form.index) }
+    data: { remote: true, url: champs_dossier_link_path(champ.id) }
 
   .help-block
     = render partial: 'shared/champs/dossier_link/help_block', locals: { id: champ.value }

config/routes.rb

@@ -141,8 +141,8 @@ Rails.application.routes.draw do
   end
 
   namespace :champs do
-    get ':position/dossier_link', to: 'dossier_link#show', as: :dossier_link
     get ':champ_id/siret', to: 'siret#show', as: :siret
+    get ':champ_id/dossier_link', to: 'dossier_link#show', as: :dossier_link
     post ':champ_id/carte', to: 'carte#show', as: :carte
 
     get ':champ_id/carte/features', to: 'carte#index', as: :carte_features

spec/controllers/champs/dossier_link_controller_spec.rb

@@ -1,22 +1,26 @@
 describe Champs::DossierLinkController, type: :controller do
   let(:user) { create(:user) }
-  let(:procedure) { create(:procedure, :published) }
+  let(:procedure) { create(:procedure, :published, :with_dossier_link) }
 
   describe '#show' do
     let(:dossier) { create(:dossier, user: user, procedure: procedure) }
+    let(:champ) { dossier.champs.first }
 
     context 'when user is connected' do
       render_views
       before { sign_in user }
 
+      let(:champs_attributes) do
+        champ_attributes = []
+        champ_attributes[champ.id] = { value: dossier_id }
+        champ_attributes
+      end
       let(:params) do
         {
+          champ_id: champ.id,
           dossier: {
-            champs_attributes: {
-              '1' => { value: dossier_id.to_s }
-            }
-          },
-          position: '1'
+            champs_attributes: champs_attributes
+          }
         }
       end
       let(:dossier_id) { dossier.id }
@@ -30,7 +34,7 @@ describe Champs::DossierLinkController, type: :controller do
           expect(response.body).to include('Dossier en brouillon')
           expect(response.body).to include(procedure.libelle)
           expect(response.body).to include(procedure.organisation)
-          expect(response.body).to include('.dossier-link-1 .help-block')
+          expect(response.body).to include("##{champ.input_group_id} .help-block")
         end
       end
 
@@ -42,14 +46,14 @@ describe Champs::DossierLinkController, type: :controller do
 
         it 'renders error message' do
           expect(response.body).to include('Ce dossier est inconnu')
-          expect(response.body).to include('.dossier-link-1 .help-block')
+          expect(response.body).to include("##{champ.input_group_id} .help-block")
         end
       end
     end
 
     context 'when user is not connected' do
       before do
-        get :show, params: { position: '1' }, format: :js, xhr: true
+        get :show, params: { champ_id: champ.id }, format: :js, xhr: true
       end
 
       it { expect(response.code).to eq('401') }