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module ActiveRecord
module Associations
class HasManyThroughAssociation < AssociationProxy #:nodoc:
def find(*args)
options = Base.send(:extract_options_from_args!, args)
conditions = "#{@finder_sql}"
if sanitized_conditions = sanitize_sql(options[:conditions])
conditions << " AND (#{sanitized_conditions})"
end
options[:conditions] = conditions
if options[:order] && @reflection.options[:order]
options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
elsif @reflection.options[:order]
options[:order] = @reflection.options[:order]
end
# Pass through args exactly as we received them.
args << options
@reflection.klass.find(*args)
end
def reset
@target = []
@loaded = false
end
protected
def method_missing(method, *args, &block)
if @target.respond_to?(method) || (!@reflection.klass.respond_to?(method) && Class.respond_to?(method))
super
else
@reflection.klass.with_scope(construct_scope) { @reflection.klass.send(method, *args, &block) }
end
end
def find_target
@reflection.klass.find(:all,
:select => "#{@reflection.table_name}.*",
:conditions => construct_conditions,
:from => construct_from,
:order => @reflection.options[:order],
:limit => @reflection.options[:limit],
:joins => @reflection.options[:joins],
:group => @reflection.options[:group]
)
end
def construct_conditions
through_reflection = @owner.class.reflections[@reflection.options[:through]]
if through_reflection.options[:as]
conditions =
"#{@reflection.table_name}.#{@reflection.klass.primary_key} = #{through_reflection.table_name}.#{@reflection.klass.to_s.foreign_key} " +
"AND #{through_reflection.table_name}.#{through_reflection.options[:as]}_id = #{@owner.quoted_id} " +
"AND #{through_reflection.table_name}.#{through_reflection.options[:as]}_type = '#{ActiveRecord::Base.send(:class_name_of_active_record_descendant, @owner.class).to_s}'"
else
conditions =
"#{@reflection.klass.table_name}.#{@reflection.klass.primary_key} = #{through_reflection.table_name}.#{@reflection.klass.to_s.foreign_key} " +
"AND #{through_reflection.table_name}.#{@owner.class.to_s.foreign_key} = #{@owner.quoted_id}"
end
conditions << " AND (#{interpolate_sql(sanitize_sql(@reflection.options[:conditions]))})" if @reflection.options[:conditions]
return conditions
end
def construct_from
"#{@reflection.table_name}, #{@owner.class.reflections[@reflection.options[:through]].table_name}"
end
def construct_scope
{
:find => { :conditions => construct_conditions },
:create => { @reflection.primary_key_name => @owner.id }
}
end
end
end
end
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