Ruby on rails 带carrierwave的rails迁移错误:未定义的方法'attachment';
我正在使用carrierwave gem(版本0.8.0)。当我制作“rake db:migrate”时,我看到一个奇怪的错误:Ruby on rails 带carrierwave的rails迁移错误:未定义的方法'attachment';,ruby-on-rails,ruby-on-rails-3,carrierwave,rails-migrations,Ruby On Rails,Ruby On Rails 3,Carrierwave,Rails Migrations,我正在使用carrierwave gem(版本0.8.0)。当我制作“rake db:migrate”时,我看到一个奇怪的错误: == AddAttachmentLogoToMerchants: migrating =================================== -- change_table(:merchants) rake aborted! An error has occurred, this and all later mig
== AddAttachmentLogoToMerchants: migrating ===================================
-- change_table(:merchants)
rake aborted!
An error has occurred, this and all later migrations canceled:
undefined method `attachment' for ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::Table:0x007f900e6bde88
我的迁移:
def self.up
change_table :merchants do |t|
t.attachment :logo
end
remove_column :merchants, :logo_filename
end
def self.down
add_column :merchants, :logo_filename, :string
drop_attached_file :merchants, :logo
end
如何解决此问题?a
t中的aik。附件
附件
应为数据类型
change_table :merchants do |t|
t.attachment :logo
end
请查找postgresql的数据类型列表
如果您想要字符串,那么下面的代码应该可以工作
change_table :merchants do |t|
t.string :logo
end
这对我没有帮助,还有“未定义的方法”“附件”