"NoMethodError: undefined method `type' for "character varying":String" after "rake db:migrate"

Question

我尝试在微博中添加签到，但抽取后出现错误db:migrate..这是什么意思？

错误

  $ rake db:migrate --trace
    ** Invoke db:migrate (first_time)
    ** Invoke environment (first_time)
    ** Execute environment
    ** Invoke db:load_config (first_time)
    ** Execute db:load_config
    ** Execute db:migrate
    rake aborted!
    NoMethodError: undefined method `type' for "character varying":String

add_checkin_to_microposts

 class AddCheckinToMicroposts < ActiveRecord::Migration
   def change
      add_column :microposts, :location, :point, :geographic => true
   end
 end

database.yml

 development:
  adapter: postgresql
  schema_search_path: public, postgis
  encoding: unicode
  database: blog_development
  host: localhost
  pool: 5
  username: ******** 
  password: 

Answer 1

您遇到的问题是 point 方法在 ActiveRecord 中不存在。

为 table 实例化一个新列。类型参数通常是迁移本机类型之一，它是以下之一：:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :time, :date, ：二进制，：布尔值。

更多信息请阅读http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/TableDefinition.html#method-i-column

希望对您有所帮助

Answer 2

假设你使用的是 gem activerecord-postgis-adapter，你最好尝试将数据库适配器更改为 postgis，如他们官方文档中所建议的：

https://github.com/rgeo/activerecord-postgis-adapter