File: empty_array_ignore_nulls.rb [sequel-4.23.0 Documentation]

Last Modified
  2015-09-06 14:04:38 +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 = 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)