如何在 Firestore 中查询数组中的值

Question

根据 Firebase Firestore 文档，为了查询数组包含特定值的集合，您可以这样做：

citiesRef.whereField("regions", arrayContains: "west_coast")

只有当我尝试在 Swift 4 中编写它时，我才会收到以下错误：

Argument labels '(_:, arrayContains:)' do not match any available overloads

查看可用的重载会产生以下结果：

Query whereField(field: String, isEqualTo: Any)
Query whereField(path: FieldPath, isEqualTo: Any)
Query whereField(field: String, isLessThan: Any)
Query whereField(path: FieldPath, isLessThan: Any)
Query whereField(field: String, isGreaterThan: Any)
Query whereField(path: FieldPath, isGreaterThan: Any)
Query whereField(field: String, isLessThanOrEqualTo: Any)
Query whereField(path: FieldPath, isLessThanOrEqualTo: Any)
Query whereField(field: String, isGreaterThanOrEqualTo: Any)
Query whereField(path: FieldPath, isGreaterThanOrEqualTo: Any)

里面没有关于数组或包含的内容。文档过时了吗？我错过了什么？ Docs found here

我的播客文件：

 platform :ios, '9.0'

target 'Appname' do
use_frameworks!

# Pods for Appname

pod ‘Firebase/Core’
pod ‘Firebase/Auth’
pod 'Firebase/Database'
pod 'Firebase/Firestore'
pod 'Firebase/Storage'
pod 'Firebase/Invites'
pod 'SwiftGifOrigin', '~> 1.6'
pod 'Kingfisher', '~> 4.0'
pod 'AudioKit', '~> 4.0'
pod 'KSTokenView', '~> 4.0'
pod 'ReachabilitySwift'
pod 'ZFTokenField'
pod 'SlackTextViewController'
pod 'RealmSwift'

target 'AppnameTests' do
 inherit! :search_paths
 # Pods for testing
end

target 'AppnameUITests' do
 inherit! :search_paths
 # Pods for testing
end

end

Answer 1

arrayContains 支持在 Firestore pod 的 5.5.0 中发布。确保您使用的是该版本或更高版本。 Read the release notes here.