ActiveRecord可以在迁移之外创建表吗? [英] Can ActiveRecord create tables outside of a migration?

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问题描述

我正在使用非Rails网络应用程序,因此默认情况下没有迁移脚本。



Sequel ORM让我可以在脚本中轻松创建表格:

 #!/ usr / bin / env ruby​​ 

需要'rubygems'
require'sequel'

##连接到数据库
DB = Sequel.sqlite('./ ex1.db')

除非DB.table_exists? :posts
DB.create_table:posts do
primary_key:id
varchar:title
text:body
end
end



<解决方案

我目前的理解是,所有的修改数据或模式都必须通过迁移来完成。我有 github上的完整rakefile



或者,如果它只是一个初始化脚本,可以使用以下脚本。

  ActiveRecord :: Base.establish_connection(
:adapter =>'sqlite3',
:database =>'./lesson1_AR.db '


ActiveRecord :: Migration.class_eval do
create_table:posts do | t |
t.string:title
t.text:body
end

create_table:people do | t |
t.string:first_name
t.string:last_name
t.string:short_name
end

create_table:tags do | t |
t.string:tags
end
end


I am working on a non Rails web app, so no migrations script by default.

The Sequel ORM lets me create tables easily in a script:

#!/usr/bin/env ruby

require 'rubygems'
require 'sequel'

## Connect to the database
DB = Sequel.sqlite('./ex1.db')

unless DB.table_exists? :posts
  DB.create_table :posts do
    primary_key :id
    varchar :title
    text :body
  end
end

Is there a way todo this with ActiveRecord outside of migrations?

解决方案

My current understanding is no, all modifications data or schema have to be done through a migration. I have a complete rakefile on github which can be used to perform the migrations outside of Rails.

Alternatively if it is just an initialisation script the following could be used.

ActiveRecord::Base.establish_connection(
   :adapter   => 'sqlite3',
   :database  => './lesson1_AR.db'
)

ActiveRecord::Migration.class_eval do
  create_table :posts do |t|
        t.string  :title
        t.text :body
   end

   create_table :people do |t|
      t.string :first_name
      t.string :last_name
      t.string :short_name
   end

   create_table :tags do |t|
      t.string :tags
   end 
end

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