allow unattached fci

app/models/france_connect_information.rb

@@ -15,7 +15,7 @@
 #  created_at                    :datetime         not null
 #  updated_at                    :datetime         not null
 #  france_connect_particulier_id :string
-#  user_id                       :integer          not null
+#  user_id                       :integer
 #
 class FranceConnectInformation < ApplicationRecord
   belongs_to :user, optional: true

db/migrate/20211011083203_remove_user_id_not_null_constraint_to_france_connect_information.rb

@@ -0,0 +1,5 @@
+class RemoveUserIdNotNullConstraintToFranceConnectInformation < ActiveRecord::Migration[6.1]
+  def change
+    change_column_null(:france_connect_informations, :user_id, true)
+  end
+end

db/schema.rb

@@ -473,7 +473,7 @@ ActiveRecord::Schema.define(version: 2021_10_12_100819) do
     t.date "birthdate"
     t.string "birthplace"
     t.string "france_connect_particulier_id"
-    t.integer "user_id", null: false
+    t.integer "user_id"
     t.string "email_france_connect"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false