Ajout d'une source pour les MetadataMapping

Ça aidera à faire du nettoyage, par exemple sur ce qui vient 
automatiquement de LDAP.

db/migrate/20210116165351_add_source_to_metadata_mappings.rb

@@ -0,0 +1,5 @@
+class AddSourceToMetadataMappings < ActiveRecord::Migration[6.1]
+  def change
+    add_column :metadata_mappings, :source, :string, limit: 20
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_01_06_221142) do
+ActiveRecord::Schema.define(version: 2021_01_16_165351) do
 
   create_table "action_mailbox_inbound_emails", force: :cascade do |t|
     t.integer "status", default: 0, null: false
@@ -73,6 +73,7 @@ ActiveRecord::Schema.define(version: 2021_01_06_221142) do
     t.string "entity"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
+    t.string "source", limit: 20
     t.index ["input"], name: "index_metadata_mappings_on_input"
   end
 

lib/tasks/metadata_mappings_import.rake

@@ -55,10 +55,10 @@ namespace :metadata_mappings do
       end
 
       metadata.each do |input, meta|
-        mapping = MetadataMapping.find_or_initialize_by(input: input) { |record|
-          record.server = meta[:server]
-          record.entity = meta[:entity]
-        }
+        mapping = MetadataMapping.find_or_initialize_by(input: input)
+        mapping.server = meta[:server]
+        mapping.entity = meta[:entity]
+        mapping.source = :ldap
         mapping.save
       end