try065

Make `t.timestamps` with precision by default
rails/rails#34970

app/models/user.rb

@@ -0,0 +1,8 @@
+class User < ApplicationRecord
+  scope :find_first, -> {
+    created_at = first.created_at
+    t = Time.new(created_at.year, created_at.month, created_at.day, created_at.hour, created_at.min, created_at.sec)
+    # t = Time.new(created_at.year, created_at.month, created_at.day, created_at.hour, created_at.min, created_at.sec) + created_at.subsec
+    where(created_at: t)
+  }
+end

db/migrate/20190726065102_create_users.rb

@@ -0,0 +1,9 @@
+class CreateUsers < ActiveRecord::Migration[6.0]
+  def change
+    create_table :users do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,21 @@
+# 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.
+#
+# This file is the source Rails uses to define your schema when running `rails
+# db:schema:load`. When creating a new database, `rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 2019_07_26_065102) do
+
+  create_table "users", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.string "name"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+  end
+
+end

db/seeds.rb

@@ -1,7 +1 @@
-# 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 rails db:seed command (or created alongside the database with db:setup).
-#
-# Examples:
-#
-#   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
-#   Character.create(name: 'Luke', movie: movies.first)
+User.create(name: 'Taro')

test/fixtures/users.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString

test/models/user_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class UserTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end