Last Modified
  2013-08-05 09:12:07 +0000
Requires

## Description

This changes Sequel's literalization of IN/NOT IN with an empty array value to not return NULL even if one of the referenced columns is NULL:

    DB[:test].where(:name=>[])
    # SELECT * FROM test WHERE (1 = 0)
    DB[:test].exclude(:name=>[])
    # SELECT * FROM test WHERE (1 = 1)

The default Sequel behavior is to respect NULLs, so that when name is NULL, the expression returns NULL.

You can load this extension into specific datasets:

    ds = DB[:table]
    ds.extension(:empty_array_ignore_nulls)

Or you can load it into all of a database's datasets, which is probably the desired behavior if you are using this extension:

    DB.extension(:empty_array_ignore_nulls)