[Fix] Remove meaningless casting operators

[Fix] Remove wrong working casting operators

/// This protocol defines objects that can access Firestore.
public protocol FirestoreAccessible {
  var collectionRef: CollectionReference { get }
  var documentRef: DocumentReference? { get }
}

// MARK: - Helpers
public extension FirestoreAccessible {
  var asCollectionRef: CollectionReference? {
    return self as? CollectionReference
  }
  
  var asDocumentRef: DocumentReference? {
    return self as? DocumentReference
  }
}

• remove asCollectionRef, asDocumentRef.

It can be used without a where condition, whether the implementation of firestoreAccessible refers to a Collection or Document Ref. In this case, an error occurred, so I removed this code.😅

[Fix] isDocumentExists makeQuery closure's input param type modify FirestoreReference -> CollectionReference

[Fix]

• isDocumentExists makeQuery closure's input param type modify FirestoreReference -> CollectionReference.
• to handle references more clearly

[Feat] Now a document exists checking is available to query specific document's filtering for using where field.

[Feature] isDocumentExists func.

Previously, when the endpoint's firestoreAccessible type was a specific document path, a bool value could be received to determine whether the document exists.

Now you can find through query whether a specific document exists for a collection.

[Feat] Change specific extension helpers access control from internal to public

[Feat] Change specific extension helpers access control from internal to public

[Feature] FirestoreDocumentSupportable protocol

[Feature]

• Declared the isDocumentExists function in the FirestoreDocumentSupportable protocol.
• Implemented isDocumentExists function in FirestoreService

[Feature] the number of documents in a collection Retrieve logic implementation.

[Feature]

• Retrieve the number of documents in a collection using aggressive query logic implement in request(endpoint:)
  • It execute to retrieve the number of all documents in a specified collectionRef from FirestoreAccessible.
  • This method using AggrateQuery's count() that match between 0 and 1000 index entries billed for one documen read: ]

• Set Endpoint's responseDTO's type Int and FirestoreAccessible must return CollectionReference without DocumentReference and then use this method: ]

[References]

• official Document aggregation-queries link
• official Document AggregateSource link
• stackOverflow Cloud Firestore collection count

[Fix] Modified unexpected logic

[Fix] Modified unexpected logic

• Modified unexpected logic in request(endpoint:).
• "FirestoreMethod case .deleteACollection" was never called, becuse endpoint's request documentRef instance check logic was located at the top.

[Feat] Add batch function and a collection document delete logic, FirestoreMethod type

[Feautre]

• Implemented logic to delete all documents in a collection using batch.
• improved, including saving some redundant logic using Combine+extension.
• Previously, when receiving collection documents, the endpoints response DTO type was specified as a single type even if it had to be received as an array, but now it must be specified as an array. 🤩

[Example]

1. When deleting all documents in a collection, set the FirestoreMethod type to deleteADocument.
2. And then, call a request(endpoint:) func using FirestoreService object ! delete it.
3. Before deletion, FirestoreAccessible's documentRef must be nil and collectionRef must be specified as the deletion target path in the endpoint.

---

References:

• Firebase Document link
• Firebase | WriteBatch document link

[Feature] Append publisher's helper mehtods

[Feature]

• Define sink(promise:) helpers when the publisher's Output value is Void and Future's promise is used

[Feature] Add throw error in FirestoreQueryHandler and handle in FirestoreService

[Feature]

• In FirestoreQueryable, it is now possible to throw an error in the FirestoreQueryHandler closure!!
• Casting computed properties is now possible in FirestoreAccessible😄