te_fenua_champ: added export

app/models/champs/te_fenua_champ.rb

@@ -104,6 +104,19 @@ def for_api
   end
 
   def for_export
-    nil
+    geo_json_from_value&.map do |k, v|
+      case k
+      when :parcelles
+        for_each_feature(v) { |_f, p| "Parcelle n°#{p[:sec_parcelle]} - #{p[:surface_adop]} m2 - #{p[:terre]} à #{p[:commune]} (#{p[:ile]})" }
+      when :zones_manuelles
+        for_each_feature(v) { |f, p| "#{f[:id]} à #{p[:commune]} (#{p[:ile]})" }
+      end
+    end&.join("\r\n")
+  end
+
+  def for_each_feature(value)
+    value[:features].map do |f|
+      yield f, f[:properties]
+    end.join("\r\n")
   end
 end