Reword block form doc for AR::Calculations#{count,sum} [ci-skip]

Author: jonathanhefner

activerecord/lib/active_record/relation/calculations.rb

@@ -82,15 +82,15 @@ def truncate(name)
     # Note: not all valid {Relation#select}[rdoc-ref:QueryMethods#select] expressions are valid +count+ expressions. The specifics differ
     # between databases. In invalid cases, an error from the database is thrown.
     #
-    # When given a block, loads all records in the relation, if the relation
-    # hasn't been loaded yet. Calls the block with each record in the relation.
-    # Returns the number of records for which the block returns a truthy value.
+    # When given a block, calls the block with each record in the relation and
+    # returns the number of records for which the block returns a truthy value.
     #
     #   Person.count { |person| person.age > 21 }
     #   # => counts the number of people older that 21
     #
-    # Note: If there are a lot of records in the relation, loading all records
-    # could result in performance issues.
+    # If the relation hasn't been loaded yet, calling +count+ with a block will
+    # load all records in the relation. If there are a lot of records in the
+    # relation, loading all records could result in performance issues.
     def count(column_name = nil)
       if block_given?
         unless column_name.nil?
@@ -159,16 +159,15 @@ def async_maximum(column_name)
     #
     #   Person.sum(:age) # => 4562
     #
-    # When given a block, loads all records in the relation, if the relation
-    # hasn't been loaded yet. Calls the block with each record in the relation.
-    # Returns the sum of +initial_value_or_column+ and the block return
-    # values:
+    # When given a block, calls the block with each record in the relation and
+    # returns the sum of +initial_value_or_column+ plus the block return values:
     #
     #   Person.sum { |person| person.age } # => 4562
     #   Person.sum(1000) { |person| person.age } # => 5562
     #
-    # Note: If there are a lot of records in the relation, loading all records
-    # could result in performance issues.
+    # If the relation hasn't been loaded yet, calling +sum+ with a block will
+    # load all records in the relation. If there are a lot of records in the
+    # relation, loading all records could result in performance issues.
     def sum(initial_value_or_column = 0, &block)
       if block_given?
         map(&block).sum(initial_value_or_column)