Question

When you create a table in rails, does the primary key default to :id?

I am trying to access a row in the table by :id, and it’s taking over 3 seconds to return the result.

The table contains BLOBs on the order of 5-20Mb and whenever I directly reference a row using ModleName.find(:id), the operation takes a long time.

If anyone has suggestions on how to speed up this process I”m all ears

Answer 1

The primary key is the id by default but it doesn’t mean any index has been created.

To achieve that simply add this kind of line in a migration file:

add_index(table_name, column_names, options)

See doc here.