Function querySnapshot

test/BasicQueryableMemoryDB.js:50–67

(snapshot, query)

};

function querySnapshot(snapshot, query) {
  // Never match uncreated or deleted snapshots
  if (snapshot.type == null) return false;
  // Match any snapshot when there is no query filter
  if (!query.filter) return true;
  // Check that each property in the filter equals the snapshot data
  for (var queryKey in query.filter) {
    // This fake only supports simple property equality filters, so
    // throw an error on Mongo-like filter properties with dots.
    if (queryKey.includes('.')) {
      throw new Error('Only simple property filters are supported, got:', queryKey);
    }
    if (snapshot.data[queryKey] !== query.filter[queryKey]) {
      return false;
    }
  }
  return true;
}

// sortProperties is an array whose items are each [propertyName, direction].
function snapshotComparator(sortProperties) {