安装Paperclip后不能db:migrate

Question

我刚刚安装了 Paperclip，现在无法运行 rake db:migrate。

迁移

class AddPaperclipToProfiles < ActiveRecord::Migration

  def change
        add_attachment :posts, :image  

  end
end

模特

class Profile < ActiveRecord::Base
    has_attached_file :image, styles: { small: "64x64", med: "100x100", large: "200x200", xlarge: "300x300" }

end

这里是错误

== 20151224145355 AddPaperclipToProfiles: migrating ===========================
-- add_attachment(:posts, :image)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: no such table: posts: ALTER TABLE "posts" ADD "image_file_name" varchar/Users/RichieSiegel/.rvm/gems/ruby-2.2.3/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'

Answer 1

为什么要尝试将图像添加到 posts？我想你应该改变

add_attachment :posts, :image

至：

add_attachment :profiles, :image

安装Paperclip后不能db:migrate

can't db:migrate after installing Paperclip

migration

ruby-on-rails