remove branching logic from calls to find_nth

activerecord/lib/active_record/relation/finder_methods.rb

@@ -131,7 +131,7 @@ def first(limit = nil)
       if limit
         find_nth_with_limit(offset_value, limit)
       else
-        find_nth(:first, offset_value)
+        find_nth(:first, offset_index)
       end
     end
 
@@ -181,7 +181,7 @@ def last!
     #   Person.offset(3).second # returns the second object from OFFSET 3 (which is OFFSET 4)
     #   Person.where(["user_name = :u", { u: user_name }]).second
     def second
-      find_nth(:second, offset_value ? offset_value + 1 : 1)
+      find_nth(:second, offset_index + 1)
     end
 
     # Same as +second+ but raises <tt>ActiveRecord::RecordNotFound</tt> if no record
@@ -197,7 +197,7 @@ def second!
     #   Person.offset(3).third # returns the third object from OFFSET 3 (which is OFFSET 5)
     #   Person.where(["user_name = :u", { u: user_name }]).third
     def third
-      find_nth(:third, offset_value ? offset_value + 2 : 2)
+      find_nth(:third, offset_index + 2)
     end
 
     # Same as +third+ but raises <tt>ActiveRecord::RecordNotFound</tt> if no record
@@ -213,7 +213,7 @@ def third!
     #   Person.offset(3).fourth # returns the fourth object from OFFSET 3 (which is OFFSET 6)
     #   Person.where(["user_name = :u", { u: user_name }]).fourth
     def fourth
-      find_nth(:fourth, offset_value ? offset_value + 3 : 3)
+      find_nth(:fourth, offset_index + 3)
     end
 
     # Same as +fourth+ but raises <tt>ActiveRecord::RecordNotFound</tt> if no record
@@ -229,7 +229,7 @@ def fourth!
     #   Person.offset(3).fifth # returns the fifth object from OFFSET 3 (which is OFFSET 7)
     #   Person.where(["user_name = :u", { u: user_name }]).fifth
     def fifth
-      find_nth(:fifth, offset_value ? offset_value + 4 : 4)
+      find_nth(:fifth, offset_index + 4)
     end
 
     # Same as +fifth+ but raises <tt>ActiveRecord::RecordNotFound</tt> if no record
@@ -245,7 +245,7 @@ def fifth!
     #   Person.offset(3).forty_two # returns the fifth object from OFFSET 3 (which is OFFSET 44)
     #   Person.where(["user_name = :u", { u: user_name }]).forty_two
     def forty_two
-      find_nth(:forty_two, offset_value ? offset_value + 41 : 41)
+      find_nth(:forty_two, offset_index + 41)
     end
 
     # Same as +forty_two+ but raises <tt>ActiveRecord::RecordNotFound</tt> if no record
@@ -334,6 +334,10 @@ def raise_record_not_found_exception!(ids, result_size, expected_size) #:nodoc:
 
     private
 
+    def offset_index
+      offset_value || 0
+    end
+
     def find_with_associations
       join_dependency = construct_join_dependency