query meaning code example

Example: firestoreConnect query

firestoreConnect((props) => {
		let propertyDocRef = firebase.firestore().collection('properties').doc(props.propertyId)
		if (!props.propertyId) return []
		return [
			{
				collection : 'properties',
                doc            : props.propertyId,
				subcollections : [
					{ collection: 'tasks' }
				],
				storeAs        : 'tasks',
				orderBy        : [
					'createdAt',
					'desc'
				]
			},
			{
				collection : 'likes',
				where      : [
					[
						'property',
						'==',
						propertyDocRef
					]
				]
			}
		]
	})