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-rw-r--r--activerecord/lib/active_record/attribute_methods/primary_key.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index a7785f8786..7c59664703 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -44,7 +44,8 @@ module ActiveRecord
end
# Defines the primary key field -- can be overridden in subclasses. Overwriting will negate any effect of the
- # primary_key_prefix_type setting, though.
+ # primary_key_prefix_type setting, though. Since primary keys are usually protected from mass assignment,
+ # remember to let your database generate them or include the key in +attr_accessible+.
def primary_key
@primary_key = reset_primary_key unless defined? @primary_key
@primary_key