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-rw-r--r--activerecord/lib/active_record/migration/compatibility.rb8
1 files changed, 1 insertions, 7 deletions
diff --git a/activerecord/lib/active_record/migration/compatibility.rb b/activerecord/lib/active_record/migration/compatibility.rb
index 92993d64a7..502cef2e20 100644
--- a/activerecord/lib/active_record/migration/compatibility.rb
+++ b/activerecord/lib/active_record/migration/compatibility.rb
@@ -93,13 +93,7 @@ module ActiveRecord
def add_column(table_name, column_name, type, options = {})
if type == :primary_key
- case adapter_name
- when "PostgreSQL"
- type = :serial
- when "Mysql2"
- type = :integer
- options[:auto_increment] = true
- end
+ type = :integer
options[:primary_key] = true
end
super