count method should not take options if it is operated on has_many association which has finder_sql or counter_sql

[#2395 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

activerecord/lib/active_record/associations/association_collection.rb

@@ -183,10 +183,13 @@ module ActiveRecord
       # descendant's +construct_sql+ method will have set :counter_sql automatically.
       # Otherwise, construct options and pass them with scope to the target class's +count+.
       def count(column_name = nil, options = {})
-        if @reflection.options[:counter_sql]
+        column_name, options = nil, column_name if column_name.is_a?(Hash)
+
+        if @reflection.options[:counter_sql] && !options.blank?
+          raise ArgumentError, "If finder_sql/counter_sql is used then options cannot be passed"
+        elsif @reflection.options[:counter_sql]
           @reflection.klass.count_by_sql(@counter_sql)
         else
-          column_name, options = nil, column_name if column_name.is_a?(Hash)
 
           if @reflection.options[:uniq]
             # This is needed because 'SELECT count(DISTINCT *)..' is not valid SQL.

activerecord/test/cases/associations/has_many_associations_test.rb

@@ -11,6 +11,32 @@ require 'models/comment'
 require 'models/person'
 require 'models/reader'
 require 'models/tagging'
+require 'models/invoice'
+require 'models/line_item'
+
+class HasManyAssociationsTestForCountWithFinderSql < ActiveRecord::TestCase
+  class Invoice < ActiveRecord::Base
+    has_many :custom_line_items, :class_name => 'LineItem', :finder_sql => "SELECT line_items.* from line_items"
+  end
+  def test_should_fail
+    assert_raise(ArgumentError) do
+      Invoice.create.custom_line_items.count(:conditions => {:amount => 0})
+    end
+  end
+end
+
+class HasManyAssociationsTestForCountWithCountSql < ActiveRecord::TestCase
+  class Invoice < ActiveRecord::Base
+    has_many :custom_line_items, :class_name => 'LineItem', :counter_sql => "SELECT COUNT(*) line_items.* from line_items"
+  end
+  def test_should_fail
+    assert_raise(ArgumentError) do
+      Invoice.create.custom_line_items.count(:conditions => {:amount => 0})
+    end
+  end
+end
+
+
 
 class HasManyAssociationsTest < ActiveRecord::TestCase
   fixtures :accounts, :categories, :companies, :developers, :projects,