rails g迁移添加列
$ rails generate migration AddDetailsToProducts part_number:string price:decimal
添加引用rails迁移
rails g migration AddUserToUploads user:references
如何创建迁移rails
rails g migration AddPartNumberToProducts
添加引用rails迁移
class AddUserToUploads < ActiveRecord::Migration
def change
add_reference :uploads, :user, index: true
end
end
如何在ruby中创建SQL表
def self.create_table
sql = <<-SQL
CREATE TABLE IF NOT EXISTS students (
name TEXT,
grade TEXT
)
SQL
DB[:conn].execute(sql)
end