[#3356] Let dynamic type handle tag generation

app/models/type_de_champ.rb

@@ -38,6 +38,7 @@ class TypeDeChamp < ApplicationRecord
   has_many :types_de_champ, -> { ordered }, foreign_key: :parent_id, class_name: 'TypeDeChamp', dependent: :destroy
 
   store_accessor :options, :cadastres, :quartiers_prioritaires, :parcelles_agricoles, :old_pj
+  delegate :tags_for_template, to: :dynamic_type
 
   # TODO simplify after migrating `options` column to (non YAML encoded) JSON
   class MaybeYaml
@@ -174,19 +175,6 @@ class TypeDeChamp < ApplicationRecord
     end
   end
 
-  def tags_for_template
-    l = libelle
-    [
-      {
-        libelle: l,
-        description: description,
-        lambda: -> (champs) {
-          champs.detect { |champ| champ.libelle == l }
-        }
-      }
-    ]
-  end
-
   private
 
   def setup_procedure

app/models/types_de_champ/type_de_champ_base.rb

@@ -1,9 +1,22 @@
 class TypesDeChamp::TypeDeChampBase
   include ActiveModel::Validations
 
-  delegate :libelle, to: :@type_de_champ
+  delegate :description, :libelle, to: :@type_de_champ
 
   def initialize(type_de_champ)
     @type_de_champ = type_de_champ
   end
+
+  def tags_for_template
+    l = libelle
+    [
+      {
+        libelle: l,
+        description: description,
+        lambda: -> (champs) {
+          champs.detect { |champ| champ.libelle == l }
+        }
+      }
+    ]
+  end
 end