Get rid of construct_count_options_from_args

activerecord/lib/active_record/associations/association_collection.rb

@@ -176,14 +176,15 @@ def sum(*args)
       # be used for the query. If no +:counter_sql+ was supplied, but +:finder_sql+ was set, the
       # 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(*args)
+      def count(column_name = nil, options = {})
         if @reflection.options[:counter_sql]
           @reflection.klass.count_by_sql(@counter_sql)
         else
-          column_name, options = @reflection.klass.scoped.send(:construct_count_options_from_args, *args)
+          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.
-            column_name = "#{@reflection.quoted_table_name}.#{@reflection.klass.primary_key}" if column_name == :all
+            column_name = "#{@reflection.quoted_table_name}.#{@reflection.klass.primary_key}" unless column_name
             options.merge!(:distinct => true)
           end
 

activerecord/lib/active_record/relation/calculation_methods.rb

@@ -180,32 +180,6 @@ def execute_grouped_calculation(operation, column_name) #:nodoc:
       end
     end
 
-    def construct_count_options_from_args(*args)
-      options     = {}
-      column_name = :all
-
-      # Handles count(), count(:column), count(:distinct => true), count(:column, :distinct => true)
-      case args.size
-      when 0
-        select = get_projection_name_from_chained_relations
-        column_name = select if select !~ /(,|\*)/
-      when 1
-        if args[0].is_a?(Hash)
-          select = get_projection_name_from_chained_relations
-          column_name = select if select !~ /(,|\*)/
-          options = args[0]
-        else
-          column_name = args[0]
-        end
-      when 2
-        column_name, options = args
-      else
-        raise ArgumentError, "Unexpected parameters passed to count(): #{args.inspect}"
-      end
-
-      [column_name || :all, options]
-    end
-
     # Converts the given keys to the value that the database adapter returns as
     # a usable column name:
     #
@@ -243,10 +217,6 @@ def type_cast_using_column(value, column)
       column ? column.type_cast(value) : value
     end
 
-    def get_projection_name_from_chained_relations
-      @select_values.join(", ") if @select_values.present?
-    end
-
     def select_for_count
       if @select_values.present?
         select = @select_values.join(", ")