ActiveRecord的配置錯誤 - ActiveRecord :: AdapterNotSpecified

爲什麼程序不運行？ActiveRecord的配置錯誤 - ActiveRecord :: AdapterNotSpecified

list.rb

require 'active_record' 
require 'yaml' 

ActiveRecord::Base.configurations = YAML.load_file('./database.yml') 
ActiveRecord::Base.establish_connection('development') 

class Student < ActiveRecord::Base 
end 

student = Student.find('123') 
puts student.id 
puts student.name

的database.yml

default: &default 
    adapter: sqlite3 
    encoding: unicode 
    pool: 5 

development: 
    <<: *default 
    database: my_database_name

list.db

sqlite的> SELECT * FROM學生;

123|foo|[email protected]

錯誤

../activerecord-5.0.0.1/lib/active_record/connection_adapters/connection_specification.rb:170:in `spec': database configuration does not specify adapter (ActiveRecord::AdapterNotSpecified)

來源

2016-11-14 faara

可能重複的[ActiveRecord :: AdapterNotSpecified databas e配置不指定適配器]（http://stackoverflow.com/questions/23336755/activerecordadapternotspecified-database-configuration-does-not-specify-adapte） – fabersky

我已經更改爲上述database.yml但錯誤再次發生。 – faara

在我來說，我使用的是字符串標識數據庫的配置我想用的，而不是一個符號（該導軌5似乎需要）

試試這個：

ActiveRecord::Base.establish_connection(:development)

來源

2017-04-19 12:12:15 Josh

ActiveRecord的配置錯誤 - ActiveRecord :: AdapterNotSpecified

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