我使用dbview_cti gem 用于创建类表继承 (CTI)。我有两个类 Person(抽象类)和 Client(继承 Person)。
问题:
当我尝试 make rake db:migrate
时,控制台写出此错误:
StandardError: An error has occurred, this and all later migrations canceled:
no implicit conversion of nil into String ../postgresql/utils.rb:24:in `quote_ident'
模范人物
class Person < ActiveRecord::Base
self.abstract_class = true
cti_base_class
end
模型客户端
class Client < Person
cti_derived_class
end
迁移create_people
class CreatePeople < ActiveRecord::Migration
def self.up
create_table :persons do |t|
t.string :pesel, null: false
t.string :first_name, null: false
t.string :last_name, null: false
t.string :email, null: false
t.date :data_of_birth, null: false
t.string :password_digest, null: false
t.timestamps null: false
end
end
def self.down
drop_table :persons
end
end
迁移create_clients
class CreateClients < ActiveRecord::Migration
def change
create_table :clients do |t|
t.references :person
t.timestamps null: false
end
cti_create_view('Client')
end
end
有关错误的更多详细信息:
> == 20160223135814 CreateClients: migrating ====================================
> -- create_table(:clients)
> -> 0.0348s
> -- cti_create_view("Client")
> rake aborted!
> StandardError: An error has occurred, this and all later migrations canceled:
>
> no implicit conversion of nil into String/home/lukas/.rvm/gems/ruby-2.2.3/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql/utils.rb:24:in
> `quote_ident'
> /home/lukas/.rvm/gems/ruby-2.2.3/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql/utils.rb:24:in
> `quoted'
> /home/lukas/.rvm/gems/ruby-2.2.3/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql/quoting.rb:31:in
> `quote_table_name'
> /home/lukas/.rvm/gems/ruby-2.2.3/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:738:in `column_definitions'
> /home/lukas/.rvm/gems/ruby-2.2.3/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql/schema_statements.rb:186:in
> `columns'
> /home/lukas/.rvm/gems/ruby-2.2.3/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/schema_cache.rb:43:in
> `columns'
知道哪里出了问题吗?
最佳答案
您的 Person
类被标记为抽象类,因此其 table_name
为 nil
。一般来说,添加了 Abstract_class,这样 gem 就可以定义自己的 ActiveRecord::Base 子类,然后可以在应用程序中继承这些子类,而不会导致 STI 逻辑进入。您可以将其设置为非抽象,也可以将表名称设置为继承:
class Person < ActiveRecord::Base
self.abstract_class = true
self.table_name = 'people'
cti_base_class
end
关于ruby-on-rails - 没有将 nil 隐式转换为 String。数据库 View _cti,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35584788/