public function get_collection_params() {

		$query_params = parent::get_collection_params();

		$query_params['context']['default'] = 'view';

		// We're not currently implementing searching for all of our controllers.
		if ( empty( $this->is_searchable ) ) {
			unset( $query_params['search'] );
		} elseif ( ! empty( $this->search_columns_mapping ) ) {

			$search_columns = array_keys( $this->search_columns_mapping );

			$query_params['search_columns'] = array(
				'description' => __( 'Column names to be searched. Accepts a single column or a comma separated list of columns.', 'lifterlms' ),
				'type'        => 'array',
				'items'       => array(
					'type' => 'string',
					'enum' => $search_columns,
				),
				'default'     => $search_columns,
			);
		}

		// page and per_page params are already specified in WP_Rest_Controller->get_collection_params().

		$query_params['order'] = array(
			'description'       => __( 'Order sort attribute ascending or descending.', 'lifterlms' ),
			'type'              => 'string',
			'default'           => 'asc',
			'enum'              => array( 'asc', 'desc' ),
			'validate_callback' => 'rest_validate_request_arg',
		);

		$query_params['orderby'] = array(
			'description'       => __( 'Sort collection by object attribute.', 'lifterlms' ),
			'type'              => 'string',
			'default'           => $this->orderby_properties[0],
			'enum'              => $this->orderby_properties,
			'validate_callback' => 'rest_validate_request_arg',
		);

		$query_params['include'] = array(
			'description'       => __( 'Limit results to a list of ids. Accepts a single id or a comma separated list of ids.', 'lifterlms' ),
			'type'              => 'array',
			'items'             => array(
				'type' => 'integer',
			),
			'validate_callback' => 'rest_validate_request_arg',
		);

		$query_params['exclude'] = array(
			'description'       => __( 'Exclude a list of ids from results. Accepts a single id or a comma separated list of ids.', 'lifterlms' ),
			'type'              => 'array',
			'items'             => array(
				'type' => 'integer',
			),
			'validate_callback' => 'rest_validate_request_arg',
		);

		return $query_params;
	}