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#6284 ✓stale

Referencing scope of parent class using set_table_name generates incorrect SQL with parent table name

Reported by Fluxx | January 12th, 2011 @ 06:56 PM

It seems that when call a scope on a subclass using set_table_name, where the scope is defined in the parent class, results in using the table name of the parent.

Here is a basic script to repro the issue. This is on ActiveRecord 3.0.3:

require "rubygems"
require "active_record"

    :adapter => "sqlite3",
    :dbfile  => ":memory:",
    :database => "test"

ActiveRecord::Schema.define do

  create_table "people", :force => true do |t|
    t.string   "name", :null => false
  create_table "children", :force => true do |t|
    t.string   "name", :null => false
    t.string   "favorite_toy", :null => false

class People < ActiveRecord::Base
  scope :named, lambda { |name| where(:name => name) }

class Child < People
  set_table_name "children"

People.create(:name => "Fred")
p People.named("Fred")

Child.create(:name => "Jonny", :favorite_toy => "Elmo")
p Child.named("Jonny")

Running it results in:

jeff ~ $ ruby ar_inheritance_test.rb 
-- create_table("people", {:force=>true})
   -> 0.2486s
-- create_table("children", {:force=>true})
   -> 0.0079s
[#<People id: 1, name: "Fred">]
/opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract_adapter.rb:202:in `log': SQLite3::SQLException: no such column: SELECT "children".* FROM "children" WHERE ("people"."name" = 'Jonny') (ActiveRecord::StatementInvalid)
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/sqlite_adapter.rb:135:in `execute'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/sqlite_adapter.rb:284:in `select'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/query_cache.rb:56:in `select_all'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/base.rb:467:in `find_by_sql'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/relation.rb:64:in `to_a'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-3.0.3/lib/active_record/relation.rb:356:in `inspect'
    from ar_inheritance_test.rb:37:in `p'
    from ar_inheritance_test.rb:37

I believe the SQL generated should be:

SELECT "children".* FROM "children" WHERE ("children"."name" = 'Jonny')

Comments and changes to this ticket

  • rails

    rails April 13th, 2011 @ 01:00 AM

    • State changed from “new” to “open”

    This issue has been automatically marked as stale because it has not been commented on for at least three months.

    The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.

    Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.

  • rails

    rails April 13th, 2011 @ 01:00 AM

    • State changed from “open” to “stale”

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