feat(dossier): toggle conditional champs visibility

app/controllers/users/dossiers_controller.rb

@@ -172,7 +172,7 @@ module Users
 
       respond_to do |format|
         format.html { render :brouillon }
-        format.turbo_stream
+        format.turbo_stream { render layout: false }
       end
     end
 

app/models/champ.rb

@@ -180,8 +180,24 @@ class Champ < ApplicationRecord
     raise NotImplemented.new(:fetch_external_data)
   end
 
+  def conditional?
+    type_de_champ.condition.present?
+  end
+
+  def visible?
+    if conditional?
+      type_de_champ.condition.compute(champs_for_condition)
+    else
+      true
+    end
+  end
+
   private
 
+  def champs_for_condition
+    private? ? dossier.champs_private : dossier.champs
+  end
+
   def html_id
     "#{stable_id}-#{id}"
   end

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

@@ -1,4 +1,4 @@
-.editable-champ{ class: "editable-champ-#{champ.type_champ}", id: champ.input_group_id, data: autosave_available?(champ) ? { controller: 'autosave' } : {} }
+.editable-champ{ class: "editable-champ-#{champ.type_champ} #{champ.visible? ? '' : 'hidden'}", id: champ.input_group_id, data: autosave_available?(champ) ? { controller: 'autosave' } : {} }
   - if champ.repetition?
     %h3.header-subsection= champ.libelle
     - if champ.description.present?

app/views/users/dossiers/update_brouillon.turbo_stream.haml

@@ -0,0 +1,5 @@
+- @dossier.champs.filter(&:conditional?).each do |champ|
+  - if champ.visible?
+    = turbo_stream.show champ.input_group_id
+  - else
+    = turbo_stream.hide champ.input_group_id

spec/system/users/brouillon_spec.rb

@@ -271,6 +271,28 @@ describe 'The user' do
     expect(page).to have_text('file.pdf')
   end
 
+  context 'with condition' do
+    include Logic
+
+    let(:procedure) { create(:procedure, :published, :for_individual, :with_yes_no, :with_type_de_champ) }
+    let(:revision) { procedure.published_revision }
+    let(:yes_no_type_de_champ) { revision.types_de_champ.first }
+    let(:type_de_champ) { revision.types_de_champ.last }
+    let(:condition) { ds_eq(champ_value(yes_no_type_de_champ.stable_id), constant(true)) }
+
+    before { type_de_champ.update(condition: condition) }
+
+    scenario 'fill a dossier', js: true do
+      log_in(user, procedure)
+
+      fill_individual
+
+      expect(page).to have_field(type_de_champ.libelle, with: '', visible: false)
+      choose('Oui')
+      expect(page).to have_field(type_de_champ.libelle, with: '', visible: true)
+    end
+  end
+
   context 'draft autosave' do
     scenario 'autosave a draft', js: true do
       log_in(user, simple_procedure)