Supression des contraintes de nullité

app/models/email.rb

@@ -11,13 +11,6 @@ class Email < ApplicationRecord
   serialize :servers,       Array
   serialize :issues,        Array
 
-  validates :message_id,    presence: true
-  validates :subject,       presence: true
-  validates :date,          presence: true
-  validates :delivered_to,  presence: true
-  validates :from,          presence: true
-  validates :headers,       presence: true
-
   paginates_per 10
 
   def postponed?

db/migrate/20210129124143_create_emails.rb

@@ -1,12 +1,12 @@
 class CreateEmails < ActiveRecord::Migration[6.1]
   def change
     create_table :emails do |t|
-      t.string :message_id, null: false
-      t.string :subject, null: false
-      t.datetime :date, null: false
-      t.string :to, null: false
-      t.string :delivered_to, null: false
-      t.string :from, null: false
+      t.string :message_id
+      t.string :subject
+      t.datetime :date
+      t.string :to
+      t.string :delivered_to
+      t.string :from
       t.text :headers
       t.text :plain_body
       t.boolean :cron,          default: false, null: false

db/schema.rb

@@ -61,12 +61,12 @@ ActiveRecord::Schema.define(version: 2021_01_29_124143) do
   end
 
   create_table "emails", force: :cascade do |t|
-    t.string "message_id", null: false
-    t.string "subject", null: false
-    t.datetime "date", null: false
-    t.string "to", null: false
-    t.string "delivered_to", null: false
-    t.string "from", null: false
+    t.string "message_id"
+    t.string "subject"
+    t.datetime "date"
+    t.string "to"
+    t.string "delivered_to"
+    t.string "from"
     t.text "headers"
     t.text "plain_body"
     t.boolean "cron", default: false, null: false