小编Rod*_*igo的帖子

我是 Ruby on Rails 开发的新手

有人可以向我解释一下这个命令行的作用吗bundle exec rake jobs:work

我不明白什么是worker以及命令行可以做什么。

有人可以给我一些例子吗？

谢谢

我和我的朋友讨论我们的项目，我们正在绘制序列图（UML 2）。他告诉我，时序图是由用例绘制的。这意味着我们应该为每个用例绘制一个序列图。这是正确的吗 ？谢谢你的任何建议。

我正在尝试使用Salesforce sdk开发在本机android中使用smartStore.

我已经关注了Salesforce文档,每当我想要使用SmartStoreSDKManager的实例时

SmartStoreSDKManager sdkManager = SmartStoreSDKManager.getInstance();

我的应用崩溃异常:

FATAL EXCEPTION: main
Process: com.audi.audidrive, PID: 21152
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.audi.audidrive/com.audi.audidrive.activities.ClaimActivity}
:java.lang.ClassCastException: com.salesforce.androidsdk.app.SalesforceSDKManager cannot be cast to com.salesforce.androidsdk.smartstore.app.SmartStoreSDKManager
                                                                            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3190)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3300)
at android.app.ActivityThread.access$1000(ActivityThread.java:211)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1705)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) Caused by: java.lang.ClassCastException: com.salesforce.androidsdk.app.SalesforceSDKManager cannot be cast to com.salesforce.androidsdk.smartstore.app.SmartStoreSDKManager
 atcom.salesforce.androidsdk.smartstore.app.SmartStoreSDKManager.getInstance(SmartStoreSDKManager.java:132)
at com.audi.audidrive.activities.ClaimActivity.onCreate(ClaimActivity.java:88)
at android.app.Activity.performCreate(Activity.java:6575)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3143)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3300) 
at android.app.ActivityThread.access$1000(ActivityThread.java:211) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1705) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:6946) …