## 発生している問題・エラーメッセージ

Rails4 で DB に json のカラムを追加しようと考えています。しかし、 `bundle exec rake db:migrate`
を実行しようとすると、エラーが出てしまい、それ以降進まなくなっています。

もし、わかる方がいらしたら、嬉しいです。

```

    == 20190123214656 AddPlansToImages: migrating =================================
    -- add_column(:images, :plans, :json)
    rake aborted!
    StandardError: An error has occurred, all later migrations canceled:
    
    Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'json' at line 1: ALTER TABLE `images` ADD `plans` json
    /Users/hiroshi/Desktop/sunny/db/migrate/20190123214656_add_plans_to_images.rb:3:in `change'
    
    Caused by:
    ActiveRecord::StatementInvalid: Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'json' at line 1: ALTER TABLE `images` ADD `plans` json
    /Users/hiroshi/Desktop/sunny/db/migrate/20190123214656_add_plans_to_images.rb:3:in `change'
    
    Caused by:
    Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'json' at line 1
    /Users/hiroshi/Desktop/sunny/db/migrate/20190123214656_add_plans_to_images.rb:3:in `change'
    Tasks: TOP => db:migrate
    (See full trace by running task with --trace)
    
```

* * *

## 該当のソースコード

### コンソール

```

    $ rails generate migration AddPlansToImages plans:json
    
     rake db:migrate
    
```

### Gemfile

```

    source 'https://rubygems.org'
    
    # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
    gem 'rails', '4.2.8'
    # Use mysql as the database for Active Record
    gem 'mysql2', '0.3.18'
    # Use SCSS for stylesheets
    gem 'sass-rails', '~> 4.0.2'
    # Use Uglifier as compressor for JavaScript assets
    gem 'uglifier', '>= 1.3.0'
    # Use CoffeeScript for .coffee assets and views
    gem 'coffee-rails', '~> 4.1.0'
    # See https://github.com/rails/execjs#readme for more supported runtimes
    # gem 'therubyracer', platforms: :ruby
    
    # Use jquery as the JavaScript library
    gem 'jquery-rails'
    # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
    gem 'turbolinks'
    # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
    gem 'jbuilder', '~> 2.0'
    # bundle exec rake doc:rails generates the API under doc/api.
    gem 'sdoc', '~> 0.4.0', group: :doc
    
    # Use ActiveModel has_secure_password
    # gem 'bcrypt', '~> 3.1.7'
    
    # Use Unicorn as the app server
    # gem 'unicorn'
    
    # Use Capistrano for deployment
    # gem 'capistrano-rails', group: :development
    
    group :development, :test do
      # Call 'byebug' anywhere in the code to stop execution and get a debugger console
      gem 'byebug'
    end
    
    group :development do
      # Access an IRB console on exception pages or by using <%= console %> in views
      gem 'web-console', '~> 2.0'
    
      # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
      gem 'spring'
    end
    
    gem 'pry-rails'
    gem 'compass-rails','~> 2.0'
    gem 'sprockets', '2.11.0'
    #pagenation
    gem 'kaminari'
    #login_logout
    gem 'devise'
    gem 'paperclip'
    
    #chat
    gem 'websocket-rails'
    gem 'faye-websocket', '0.10.0'
    #image
    gem 'carrierwave'
    gem 'rmagick'
    #date
    gem 'momentjs-rails'
    gem 'bootstrap3-datetimepicker-rails'
    
```

### `db/migrate`

```

    class AddPlansToImages < ActiveRecord::Migration
      def change
        add_column :images, :plans, :json
      end
    end
    
```

* * *

## 補足情報 (OS, ツールのバージョンなど)

  * MySQL のバージョン  
mysql Ver 14.14 Distrib 5.7.19, for osx10.12 (x86_64) using EditLine wrapper
CC BY-SA 4.0
2019-01-23T22:04:00.230
52271
2019-05-05T06:57:39.990
2019-05-05T06:57:39.990
32986
30829
question
ruby-on-rails ruby mysql
Rails4でDBにjsonのカラムを追加することができない