Firestore查询不返回基于searchText的数据

Question

我的searchBar文本正在更新我的查询，但没有像我预期的那样从Firestore返回数据。

这是我的数据模型中的方法：

func getMealPlans(starred starredOnly:Bool = false, textToQuery searchText:String = "") {
        
        listener?.remove()

        let db = Firestore.firestore()
        
        var query:Query = db.collection("mealPlans")
           
        query = query.whereField("title", isGreaterThanOrEqualTo: searchText)
        
        func queryData() {
            
            self.listener = query.addSnapshotListener({ (snapshot, error) in
                
                // Check for errors
                if error == nil && snapshot != nil {
                    
                    var mealPlans = [MealPlan]()
                    
                    // Parse documents into mealPlans
                    for doc in snapshot!.documents {
                        
                        let m = MealPlan(
                            docID: doc["docID"] as? String,
                            title: doc["title"] as! String)
                        
                        mealPlans.append(m)
                    }
                    // Call the delegate and pass back the notes in the main thread
                    DispatchQueue.main.async {
                        self.delegate?.mealPlansRetrieved(mealPlans: mealPlans)
                    }
                }
            })
        }

        queryData()   
    }

这是我的视图控制器中的搜索栏方法：

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

        let searchedText = searchText.lowercased()
        model.getMealPlans(textToQuery: searchedText)
        
        self.tableView.reloadData()
    }

我想知道我的模型中的query=query.wherefield（“title”,isgreaterthanorequalto:searchText)是否可能是我的问题的根源。当我在此代码后打印（searchText)时，我键入的searchText会按预期显示在控制台中。但是表视图不会更新具有匹配title的单元格，即使它是完全匹配的。

Answer 1

 You need to use document data property to load MealPlan. Better make it the following way:
    
    1. Define data model as Codable:

import Foundation
import FirebaseFirestore
import FirebaseFirestoreSwift
            
struct MealPlan: Codable {
    @DocumentID var id: String?
    title: String?
}

2. Then use compact map to get mealPlans:

mealPlans = snapshot.documents.compactMap { document -> MealPlan? in
     do {
         let result = try document.data(as: MealPlan.self)
         return result
     }
     catch {
         print(error)
         return nil
     }
}

Answer 2

你需要完成

func getMealPlans(starred starredOnly:Bool = false, textToQuery searchText:String = "",completion:@escaping(() ->([MealPlan]))) {
    listener?.remove()
    let db = Firestore.firestore()
    var query:Query = db.collection("mealPlans")
    query = query.whereField("title", isGreaterThanOrEqualTo: searchText)
    self.listener = query.addSnapshotListener({ (snapshot, error) in
        // Check for errors
        if error == nil && snapshot != nil { 
            var mealPlans = [MealPlan]() 
            // Parse documents into mealPlans
            for doc in snapshot!.documents { 
                let m = MealPlan(
                    docID: doc["docID"] as? String,
                    title: doc["title"] as! String) 
                mealPlans.append(m)
            }
            // Call the delegate and pass back the notes in the main thread
            DispatchQueue.main.async {
                self.delegate?.mealPlansRetrieved(mealPlans: mealPlans) // remove this if you need to as callback will deliver the result to you
                completion(mealPlans)
            }
        }
   })
}

然后

model.getMealPlans(textToQuery: searchedText) {  res in
    // change table model to res here 
    self.tableView.reloadData() 
}