gistfile1.txt

[11] pry(main)> a = Host.new(id: SecureRandom.uuid, name: 'securerandom')
=> #<Host:0x0000564fdb674748
 id: "7d9cc9e2-e962-48ff-a914-b9ad258d54f0",
 name: "securerandom",
 created_at: nil,
 updated_at: nil,
 account_id: nil>
[12] pry(main)> a.valid?
  Host Exists (1.2ms)  SELECT  1 AS one FROM "hosts" WHERE "hosts"."name" = $1 AND "hosts"."account_id" IS NULL LIMIT $2  [["name", "securerandom"], ["LIMIT", 1]]
=> true
[13] pry(main)> a.save
   (0.7ms)  BEGIN
  Host Exists (2.4ms)  SELECT  1 AS one FROM "hosts" WHERE "hosts"."name" = $1 AND "hosts"."account_id" IS NULL LIMIT $2  [["name", "securerandom"], ["LIMIT", 1]]
  Host Create (3.6ms)  INSERT INTO "hosts" ("id", "name", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id"  [["id", "7d9cc9e2-e962-48ff-a914-b9ad258d54f0"], ["name", "securerandom"], ["created_at", "2019-05-14 11:14:15.399753"], ["updated_at", "2019-05-14 11:14:15.399753"]]
   (2.5ms)  COMMIT
=> true
[14] pry(main)> a.id
=> "7d9cc9e2-e962-48ff-a914-b9ad258d54f0"
[15] pry(main)> b = Host.new(id: 'test', name: 'test')
=> #<Host:0x0000564fdbb857f0 id: nil, name: "test", created_at: nil, updated_at: nil, account_id: nil>