ruby on rails - ActiveRecord scope does not working -


i have following relation:

class user < activerecord::base   has_many :incoming_delegations,     :class_name => "delegation", :foreign_key => :to_user_id,     :conditions => { :active => true }   #... end

and

class delegation < activerecord::base   belongs_to :from_user, :class_name => "user"   belongs_to :to_user,   :class_name => "user"    scope :from, lambda { |user| where(:from_user_id => user.id) }   scope :to, lambda { |user| where(:to_user_id => user.id) }   #... end

now when do

delegation.from(user.find(43)) # list of delegations user user.last.incoming_delegations # list of incoming delegations

but when try:

user.last.incoming_delegations.from(user.find(43))

then following error message:

typeerror: cannot visit user         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/visitor.rb:25:in `rescue in visit'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/visitor.rb:19:in `visit'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/to_sql.rb:281:in `visit_arel_nodes_joinsource'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/visitor.rb:19:in `visit'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/to_sql.rb:135:in `visit_arel_nodes_selectcore'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/mysql.rb:41:in `visit_arel_nodes_selectcore'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/to_sql.rb:121:in `block in visit_arel_nodes_selectstatement'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/to_sql.rb:121:in `map'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/to_sql.rb:121:in `visit_arel_nodes_selectstatement'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/mysql.rb:36:in `visit_arel_nodes_selectstatement'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/visitor.rb:19:in `visit'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/visitor.rb:5:in `accept'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/to_sql.rb:19:in `accept'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/arel-3.0.2/lib/arel/visitors/bind_visitor.rb:11:in `accept'         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in         /home/jiri/.rvm/gems/ruby-1.9.3-p194@om/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:18:i ... 1 levels...

any idea cause problem?

scope :from, lambda { |user| where(:from_user_id => user.id) }

from bad name scope; name else.

this from method within arel being used when you're trying call :from scope in delegation class.


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