添加删除模型
rails 命令可以方便的添加删除模型
[root@h202 blog]# rails --help
Usage: rails COMMAND [ARGS]
The most common rails commands are:
generate Generate new code (short-cut alias: "g")
console Start the Rails console (short-cut alias: "c")
server Start the Rails server (short-cut alias: "s")
dbconsole Start a console for the database specified in config/database.yml
(short-cut alias: "db")
new Create a new Rails application. "rails new my_app" creates a
new application called MyApp in "./my_app"
In addition to those, there are:
destroy Undo code generated with "generate" (short-cut alias: "d")
plugin new Generates skeleton for developing a Rails plugin
runner Run a piece of code in the application environment (short-cut alias: "r")
All commands can be run with -h (or --help) for more information.
[root@h202 blog]# rails generate model Comment commenter:string body:text
Running via Spring preloader in process 3716
invoke active_record
create db/migrate/20160427081218_create_comments.rb
create app/models/comment.rb
invoke test_unit
create test/models/comment_test.rb
create test/fixtures/comments.yml
[root@h202 blog]#
[root@h202 blog]# rails destroy model Comment
Running via Spring preloader in process 3763
invoke active_record
remove db/migrate/20160427081218_create_comments.rb
remove app/models/comment.rb
invoke test_unit
remove test/models/comment_test.rb
remove test/fixtures/comments.yml
[root@h202 blog]#添加一个评论模型
代码语言：javascript复制[root@h202 blog]# rails generate model Comment commenter:string body:text article:references
Running via Spring preloader in process 3787
invoke active_record
create db/migrate/20160427082552_create_comments.rb
create app/models/comment.rb
invoke test_unit
create test/models/comment_test.rb
create test/fixtures/comments.yml
[root@h202 blog]# cat db/migrate/20160427082552_create_comments.rb
class CreateComments < ActiveRecord::Migration
def change
create_table :comments do |t|
t.string :commenter
t.text :body
t.references :article, index: true, foreign_key: true
t.timestamps null: false
end
end
end
[root@h202 blog]# cat app/models/comment.rb
class Comment < ActiveRecord::Base
belongs_to :article
end
[root@h202 blog]# cat test/models/comment_test.rb
require 'test_helper'
class CommentTest < ActiveSupport::TestCase
# test "the truth" do
# assert true
# end
end
[root@h202 blog]# cat test/fixtures/comments.yml
# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
one:
commenter: MyString
body: MyText
article_id:
two:
commenter: MyString
body: MyText
article_id:
[root@h202 blog]#
