tdc: add libelle_as_filename

app/models/type_de_champ.rb

@@ -676,6 +676,12 @@ class TypeDeChamp < ApplicationRecord
     end
   end
 
+  def libelle_as_filename
+    libelle.gsub(/[[:space:]]+/, ' ')
+      .truncate(30, omission: '', separator: ' ')
+      .parameterize
+  end
+
   class << self
     def champ_value(type_champ, champ)
       dynamic_type_class = type_champ_to_class_name(type_champ).constantize

spec/models/type_de_champ_spec.rb

@@ -302,4 +302,12 @@ describe TypeDeChamp do
     it { expect(create(:type_de_champ, :header_section, libelle: " 2.3 Test").libelle).to eq("2.3 Test") }
     it { expect(create(:type_de_champ, libelle: " fix me ").libelle).to eq("fix me") }
   end
+
+  describe '#safe_filename' do
+    subject { build(:type_de_champ, libelle:).libelle_as_filename }
+
+    let(:libelle) { "  #/🐉 1 très  intéressant Bilan " }
+
+    it { is_expected.to eq("1-tres-interessant-bilan") }
+  end
 end