Query

Query encapsulates Queryable Reference, load state and content.

There are two query types - array and first and they differ only by content.

state

• isLoading
• isLoaded
• isError
• error

content → Array<Document> or Document

let array = store.collection('messages').query();
await array.load();
array.content // → Array<Document>

let first = store.collection('messages').limit(1).query({ type: 'first' });
await first.load()
first.content // → Document or null

passive() → this

Makes query not to subscribe to onSnapshot observer. Instead, when query is activated, it is loaded using query.load()

class Model extends EmberObject {

  @activate().content(({ store }) => store.collection('messages').query().passive())
  query

  async load() {
    await this.promise.promise; // resolves when query is loaded
  }

}

promise → Promise<this>

Resolves when query is loaded either by query.load() or when first onSnapshot is processed.

Note: promise doesn't automatically do a load. You need to activate query using @activate decorator for this to work as expected

async load(opts) → this

• force → boolean. defaults to false

Loads query if it is not yet loaded. If force is true, query is always loaded.

let query = store.collection('messages').query();
await query.load(); // does load
await query.load(); // does nothing
await query.load({ force: true }); // does load even if query is already loaded

reload()

Alias for query.load({ force: true })

register(doc)

Registers document for reuse in query content.

let query = store.collection('messages').query();

let doc = store.collection('messages').doc().new({
  title: 'hey there'
});

query.register(doc);

await query.load();
query.content.includes(doc) // → true

Useful in rare cases where you have a reference to document and you need the same document instance in a query content when next onSnapshot is triggered.