iOS-could not set nil as the value for the key

阿新 • • 發佈：2019-01-24

從後臺請求到的資料往往存在空值, 這時前臺便無法處理資料, 賦值model屬性的時候出現: could not set nil as the value for the key的報錯.這時可用下列方式解決:

1. 在model的基類中重寫setnilvalueforkey:

- (void)setNilValueForKey:(NSString *)key{
    [self setValue:@"" forKey:key];
}

2. 另外網上給出了另一個解決方案, 你如果使用網路請求類是AFN那麼可以通過設定AFN中responseSerializer的removesKeysWithNullValues屬性來規避空值

/**
 Whether to remove keys with `NSNull` values from response JSON. Defaults to `NO`.
 */
@property (nonatomic, assign) BOOL removesKeysWithNullValues;
((AFJSONResponseSerializer *)session.responseSerializer).removesKeysWithNullValues

iOS-could not set nil as the value for the key

從後臺請求到的資料往往存在空值, 這時前臺便無法處理資料, 賦值model屬性的時候出現: could not set nil as the value for the key的報錯.這時可用下列方式解

django 報錯：ValueError: The database backend does not accept 0 as a value for AutoField.

錯誤原因：在建立一個model時，其中一個欄位你用了別一個model的做為外來鍵，並且給這個外來鍵設定了一個預設值，而這個預設值不適用於鍵model中自動建立再找一下報錯的指令碼： Applying oiarpt.0004_auto_201708

JSP報錯The value for the useBean class attribute *** is invalid.

再次 attribute use 基本 sdn 正常沒有 class art 環境：IDEA+Tomcat9+JDK1.8 在前期學習時，環境一直能夠“正常”使用，實際上環境並沒有完全搭建成功。推薦： https://blog.csdn.net/lw_power/art

spring-boot 啟動時候出現異常：The bean 'xxx' could not be injected as a 'xx.xxxx' because it is a JDK dynamic proxy that implements:

ng- for sed AC 存在 cti 解決方法 sid 失敗 The bean ‘xxxService‘ could not be injected as a ‘AaaXxxService‘ because it is a JDK dynamic proxy tha

The requested list key 'AllDepartment' could not be resolved as a collection/array/map/enumeration/

HTTP Status 500 - tag 'select', field 'list', name 'post.department.depId': The requested list key 'AllDepartment' could not be resolved as a collecti

Eclipse中pom檔案提示"CoreException:Could not get the value for parameter compilerId for plugin execu"異常

1、在pom檔案中點選異常檢視詳細資訊為：Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile

Could not set property 'xxxx' of 'class 'xxxxxxx' with value 'xxxxxx'

Teacher.mapper.xml <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http:

[iOS] Could not cast value of type ‘__NSCFNumber’ to ‘NSString’

json 長醬子： { "base": "EUR", "date": "2017-05-16", "rates": { "AUD": 1.492, }} 直接用 String 去存取 “AUD” 欄位，會出錯，解法是用 Float 或Double去接浮點數，如果需要轉成 String

Could not set property 'products' of ' class bean.Order' with value 'bean.Pr

java.io.IOException: Could not locate executable nullinwinutils.exe in the Hadoop binaries.

pan call file 2.2.0 property ade int work ctu 1：這個問題都被大家玩爛了，這裏我也記載一下，方便以後腦補： 1 SLF4J: Class path contains multiple SLF4J bindings.

Akka HTTP部署報錯：Could not resolve substitution to a value: ${akka.stream.blocking-io-dispatcher}

在idea中使用akka http完成服務端rest介面的開發與測試後，接著就可以部署到Linux伺服器上進行測試了，因為沒有限定pom中依賴包的scope為provided，所以打包時將依賴jar包也打進了專案jar包，方便執行測試，但是專案jar包較大，後續再分離依賴的jar包。打包時候po

react-native Could not find "store" in either the context or props

1.參考 https://stackoverflow.com/questions/35420989/could-not-find-store-in-either-the-context-or-props 2.在所有需要繫結Redux的檔案中使用connect 容器元件使用 connect() 方法連線 R

springboot Could not resolve placeholder 'schedu' in value "${schedu}"

在springboot的application.yml檔案中配置了引數schedu，然後在業務中通過@Value(“${schedu}”)進行賦值，但是啟動之後報如下錯誤：注意：在idea下執行的時

[VS2017 setup] Fix: We could not refresh the credentials for the account

遇到一個使用者反映VS2017 Community註冊資訊快要到期，但是他無法更新自己的Account資訊，導致無法更新license。試了很多辦法，最後解決的方法可能是： 1.通過工具欄的Help選項，選擇Send Feedback後登陸，曲線救國。 Open Visual Studi

解決Windows系統下執行hadoop程式出錯Could not locate executablenull\bin\winutils.exe in the Hadoop binaries

樓主今天在開發後端介面的時候,發現報了Could not locate executablenull\bin\winutils.exe in the Hadoop binaries 的錯誤,經過分析是我呼叫了同事寫的介面,同事那個模組是引入了

Could not set parameters for mapping: ParameterMapping

Problems Caused by: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: Pa

springboot中艱難排查IllegalArgumentException: Could not resolve placeholder 'AppID' in value "${AppID}"

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2018-07-24 15:04:09.653

Mybatis 模糊查詢 like【筆記】Could not set parameters for mapping

當使用mybatis 做模糊查詢時如果這樣寫會報 Could not set parameters for mapping: ParameterMapping{property='keywords'# 是起的佔位符的作用，但是寫在了字串裡面無法起到佔位符的作用，這是我們要用

npm ERR! code ENOLOCAL Could not install from "" as it does not contain a package.json file.解決

一、問題描述使用npm安裝時出現以下問題， $ npm install -g npm ERR! code ENOLOCAL npm ERR! Could not install from "" as

Could not resolve placeholder in string value "${XXXXXX}"

配置檔案中加入ignore-unresolvable="true" 如下所示 <context:property-placeholder location="classpath:proporties/*.properties" ignore-unresolvable=

iOS-could not set nil as the value for the key

相關推薦