在种子中，我创造了以下内容;
post = Post.create(
title: Faker::Lorem.sentence(20),
content: Faker::Lorem.paragraph,
publish: true,
administrator: administrator)
tag = Tag.create(name: Faker::Lorem.words)
post_tag = PostTag.create(post: post, tag: tag)
然后，在终端内我尝试“rake db：reset”并且它无法工作并显示以下错误;
-- initialize_schema_migrations_table()
-> 0.0049s
rake aborted!
ActiveRecord::UnknownAttributeError: unknown attribute 'publish' for Post.
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord- 4.2.5.1/lib/active_record/attribute_assignment.rb:59:in `rescue in _assign_attribute'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord- 4.2.5.1/lib/active_record/attribute_assignment.rb:54:in `_assign_attribute'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:41:in `block in assign_attributes'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:35:in `each'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:35:in `assign_attributes'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/core.rb:566:in `init_attributes'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/core.rb:281:in `initialize'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/inheritance.rb:61:in `new'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/inheritance.rb:61:in `new'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/persistence.rb:33:in `create'
/Users/laurenwoodhams/Desktop/PROJECT/RAILS-BLOG/-t/db/seeds.rb:13:in `<top (required)>'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `load'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `block in load'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:240:in `load_dependency'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `load'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5.1/lib/rails/engine.rb:547:in `load_seed'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/tasks/database_tasks.rb:250:in `load_seed'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/railties/databases.rake:183:in `block (2 levels) in <top (required)>'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/railties/databases.rake:142:in `block (2 levels) in <top (required)>'
NoMethodError: undefined method `publish=' for #<Post:0x007f98d0073d00>
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activemodel-4.2.5.1/lib/active_model/attribute_methods.rb:433:in `method_missing'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:54:in `public_send'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:54:in `_assign_attribute'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:41:in `block in assign_attributes'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:35:in `each'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/attribute_assignment.rb:35:in `assign_attributes'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/core.rb:566:in `init_attributes'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/core.rb:281:in `initialize'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/inheritance.rb:61:in `new'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/inheritance.rb:61:in `new'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/persistence.rb:33:in `create'
/Users/laurenwoodhams/Desktop/PROJECT/RAILS-BLOG/-t/db/seeds.rb:13:in `<top (required)>'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `load'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `block in load'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:240:in `load_dependency'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `load'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5.1/lib/rails/engine.rb:547:in `load_seed'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/tasks/database_tasks.rb:250:in `load_seed'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/railties/databases.rake:183:in `block (2 levels) in <top (required)>'
/Users/laurenwoodhams/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/railties/databases.rake:142:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:setup => db:seed
(See full trace by running task with --trace)
你能否告诉他为什么会推错这个错误？
谢谢
答案 0 :(得分：0)
然后，在终端内我试图“rake db：reset”。 。
尝试跑步：
rake db:migrate
rake db:reset
您的Post对象根据您的数据库没有publish属性（无论出于何种原因）。
当您运行rake db:reset新迁移时，“迁移”。相反，它会加载架构（不包括未迁移的迁移）。