Question

将我的master分支从git推送到heroku之后，我现在尝试将我的db文件迁移到heroku但是我遇到了这个错误

clydiscope$ heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up, run.6472
Migrating to DeviseCreateUsers (20141203201816)
== 20141203201816 DeviseCreateUsers: migrating ================================
-- create_table(:users)
   -> 0.3488s
-- add_index(:users, :email, {:unique=>true})
   -> 0.0146s
-- add_index(:users, :reset_password_token, {:unique=>true})
   -> 0.0143s
== 20141203201816 DeviseCreateUsers: migrated (0.3782s) =======================

Migrating to AddNameToUsers (20141206140057)
== 20141206140057 AddNameToUsers: migrating ===================================
-- add_column(:users, :name, :string)
PG::DuplicateColumn: ERROR:  column "name" of relation "users" already exists
: ALTER TABLE "users" ADD COLUMN "name" character varying(255)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::DuplicateColumn: ERROR:  column "name" of relation "users" already exists
: ALTER TABLE "users" ADD COLUMN "name" character 

/app/db/migrate/20141206140057_add_name_to_users.rb:3:in `up'

显然，有一个重复的专栏，我不知道...... 我一直在开发阶段进行迁移，它似乎在这一点上起作用。我如何更改，我的数据库现在让heroku接受它？

这是最后一行的代码。

 class AddNameToUsers < ActiveRecord::Migration
 def up
    add_column :users, :name, :string
 end

def down
  remove_column :users, :name
end
end

Answer 1

可能只是删除迁移文件20141206140057_add_name_to_users.rb将解决问题（当然，在提交并推送到Heroku之后）。

Heroku在rake db：migrate中引发了重复的列错误

1 个答案: