refactor(dossier): implement champs_for_revision

app/models/dossier.rb

@@ -1391,6 +1391,20 @@ class Dossier < ApplicationRecord
     user.france_connect_information.present?
   end
 
+  def champs_by_stable_id_with_row
+    champs_for_revision.index_by(&:stable_id_with_row)
+  end
+
+  def champs_for_revision(scope = nil, root = false)
+    champs_index = champs.group_by(&:stable_id)
+
+    if scope.is_a?(TypeDeChamp)
+      revision.children_of(scope)
+    else
+      revision.types_de_champ_for(scope, root)
+    end.flat_map { champs_index[_1.stable_id] || [] }
+  end
+
   private
 
   def create_missing_traitemets

app/models/procedure_revision.rb

@@ -155,6 +155,22 @@ class ProcedureRevision < ApplicationRecord
     dossier
   end
 
+  def types_de_champ_for(scope = nil, root = false)
+    # We return an unordered collection
+    return types_de_champ if !root && scope.nil?
+    return types_de_champ.filter { scope == :public ? _1.public? : _1.private? } if !root
+
+    # We return an ordered collection
+    case scope
+    when :public
+      types_de_champ_public
+    when :private
+      types_de_champ_private
+    else
+      types_de_champ_public + types_de_champ_private
+    end
+  end
+
   def children_of(tdc)
     if revision_types_de_champ.loaded?
       parent_coordinate_id = revision_types_de_champ