迁移后未创建 Sinatra 数据库 table

Question

我正在尝试使用 Sinatra 和 Sinatra/active 记录创建活动记录，我的迁移正在迁移到 Postgres 数据库，但没有在数据库中创建表，我在堆栈中检查了所有可能的解决方案溢出但没有用。我什至尝试从 db/migrate 文件夹中删除我的迁移文件，但输出仍然相同。一定是什么错误

Gemfile

source 'https://rubygems.org'

gem "sinatra"
gem "pg"    #for postgres
gem "activerecord" 
gem "sinatra-activerecord"

config.ru

require "./app"
run Sinatra::Application

rakefile.rb

require "./app"
require "sinatra/activerecord/rake"

app.rb

require 'sinatra'
require 'sinatra/activerecord' 
db = URI.parse('postgres://project1:project1@localhost/*****')
ActiveRecord::Base.establish_connection(
  :adapter  => db.scheme == 'postgres' ? 'postgresql' : db.scheme,
  :host     => db.host,
  :username => db.user,
  :password => db.password,
  :database => db.path[1..-1],
  :encoding => 'utf8'
 )


class Note < ActiveRecord::Base
end

class CreateNotes < ActiveRecord::Migration
  def up
    create_table :notes do |t|
        t.string    :title
        t.text  :body
        t.timestamps
    end 
  end
  def down
    drop_table  :notes
  end
end

迁移输出

user@user-Inspiron-5520:~/rails-apps/project1$ rake db:migrate
== 20150704053019 CreateNotes: migrating      ======================================
== 20150704053019 CreateNotes: migrated (0.0000s)   =============================

db 输出 (psql)

\dt

           List of relations
 Schema |       Name        | Type  |   Owner   
--------+-------------------+-------+-----------
 public | schema_migrations | table | project1
(1 row)

project1=# select * from schema_migrations;
   version     
----------------
20150704053019

（1 行）

注意： Project1 用户是拥有所有权限的超级用户

编辑

迁移文件20150704053019_create_notes.rb

class CreateNotes < ActiveRecord::Migration
  def change
  end
end

Answer 1

首先要注意@limekin 是第一个得到答案的评论：

The migration you are using to create notes table is actually kept in app.rb. But the migrate task looks for migrations inside db/migrate. If the migration file you gave at the bottom is inside the right directory, then move the migration definition from app.rb to there.

我将更详细地介绍一下。您用来创建 table 的函数属于迁移文件，因为迁移是创建、更改和删除 table、列和记录的原因。

因此，要解决您的问题，只需将应用文件中的函数上移到迁移文件中的更改函数即可。

迁移后未创建 Sinatra 数据库 table

Sinatra db table not created after migration

ruby

activerecord

sinatra

psql

sinatra-activerecord