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db/migrate/20141117201926_create_users.rb

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+class CreateUsers < ActiveRecord::Migration
+  def change
+    create_table :users do |t|
+      t.string :email
+      t.timestamps
+    end
+    add_index :users, :email, unique: true
+  end
+end

db/schema.rb

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+# encoding: UTF-8
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20141117201926) do
+
+  create_table "users", force: true do |t|
+    t.string   "email"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+  add_index "users", ["email"], name: "index_users_on_email", unique: true
+
+end

db/seeds.rb

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+# This file should contain all the record creation needed to seed the database with its default values.
+# The data can then be loaded with the rake db:seed (or created alongside the db with db:setup).
+#
+# Examples:
+#
+#   cities = City.create([{ name: 'Chicago' }, { name: 'Copenhagen' }])
+#   Mayor.create(name: 'Emanuel', city: cities.first)