This page refers to the
extension
parameter that is part of an Explore.
extension
can also be used as part of a view, as described on theextension
(for views) parameter documentation page.
extension
can also be used as part of a LookML dashboard, as described on Dashboard parameters documentation page.
Usage
extension: required
}
Hierarchyextension |
Default ValueNoneAcceptsThe value “required” |
Definition
The extension: required
parameter flags an Explore as requiring extension, which means that the Explore cannot be used on its own. The contents and settings of the Explore will only be used when the Explore is extended using the extends
parameter in another Explore.
An Explore with extension: required
is not visible to users on its own; it is intended only to act as a starting point to be extended by other Explores.
The extension
parameter accepts only the value required
. If you don’t want to require extension for an Explore, leave out the extension
parameter entirely.
An Explore with extension: required
cannot be used as an explore_source
for a data test. The LookML Validator will generate an error that the explore_source
cannot be found.
See Reusing Code with Extends for more information on using extends
for LookML objects.
Example
This basic_order_fields
Explore has the extension: required
parameter, so the Explore itself will not be visible to users:
To make use of the basic_order_fields
Explore, we can create another Explore that extends it, like this:
It may be tempting to turn on hidden
to hide Basic Order Fields, but remember that such a setting is going to be inherited by any Explore that is based on Basic Order Fields. In this particular example, Marketing Order Fields would be hidden as well if you turned on hidden
.