1 files changed, 4 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index e3ac891520..a2bb78dfcc 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -73,7 +73,7 @@ module ActiveRecord
       # accessors, mutators and query methods.
       def define_attribute_methods # :nodoc:
         return false if @attribute_methods_generated
-        # Use a mutex; we don't want two thread simultaneously trying to define
+        # Use a mutex; we don't want two threads simultaneously trying to define
         # attribute methods.
         generated_attribute_methods.synchronize do
           return false if @attribute_methods_generated
@@ -193,7 +193,7 @@ module ActiveRecord
       #
       #   person = Person.new
       #   person.column_for_attribute(:name) # the result depends on the ConnectionAdapter
-      #   # => #<ActiveRecord::ConnectionAdapters::SQLite3Column:0x007ff4ab083980 @name="name", @sql_type="varchar(255)", @null=true, ...>
+      #   # => #<ActiveRecord::ConnectionAdapters::Column:0x007ff4ab083980 @name="name", @sql_type="varchar(255)", @null=true, ...>
       #
       #   person.column_for_attribute(:nothing)
       #   # => nil
@@ -251,7 +251,7 @@ module ActiveRecord
     #   person.has_attribute?('age')    # => true
     #   person.has_attribute?(:nothing) # => false
     def has_attribute?(attr_name)
-      @attributes.include?(attr_name.to_s)
+      @attributes.key?(attr_name.to_s)
     end
 
     # Returns an array of names for the attributes available on this object.
@@ -386,7 +386,7 @@ module ActiveRecord
 
     def attribute_method?(attr_name) # :nodoc:
       # We check defined? because Syck calls respond_to? before actually calling initialize.
-      defined?(@attributes) && @attributes.include?(attr_name)
+      defined?(@attributes) && @attributes.key?(attr_name)
     end
 
     private