Question

我正在迭代所有用户个人资料以获取他们的国家/地区。我希望不包括当前用户的个人资料。如果我总共有10个用户，我只想要9个用户的国家/地区：

# helper function
def method_name
  Profile.all.select do |m|
   n = m.country.class == String # Because most countries will be nil. A shorter way to not include nil profiles?
   return n.reject! {|x| x == current_user.profile.user_id }
  end
end

上述方法应返回除当前用户之外的所有用户配置文件。

我得到的错误是

未定义的方法`拒绝！' for false：FalseClass

原因？在我看来，我可以：

<%= method_name.map do |p| p.country end %>

Answer 1

请注意在这里使用Profile.all，因为您可能会使用大量内存为数据库中的每一行实例化一个配置文件对象。

我认为最好的方法是在Profile模型中创建一个执行查询的方法，然后使用 pluck（）返回一个只包含所需国家/地区的数组。 / p>

 "C:\Program Files (x86)\SmartBear\TestComplete 11\Bin\TestComplete.exe" "C:\Users\Username\Desktop\project\TestProject1\BLABLABLA" /r /p:projectname /u:Scriptname /rt:MainScriptRoutine /run /exit

现在你可以打电话：

@echo off
set source=c:\temp\test\1
set dest_path=c:\temp\test\2\
pushd %dest_path%
setlocal enableDelayedExpansion
set "dest_folder_name=Backup"
set "n=0"
for /f "delims=" %%F in 
(
   '2^>nul dir /b /ad "%dest_folder_name%*."^|findstr /xri "%dest_folder_name%[0-9]*"'
) 
do (
  set "name=%%F"
  set "name=!name:*%dest_folder_name%=!"
  if !name! gtr !n! set "n=!name!"
)
set /a n+=1
set final_destination="%dest_path%%dest_folder_name%%n%"
md %final_destination%
robocopy %source% %final_destination% /E /R:3 /W:10 /FFT /NP /NDL
popd
@echo on

获取一系列国家/地区。这种方法比你问题中的循环更有效。

Answer 2

行true将false设置为reject! {|x| x == current_user.profile.user_id }或def method_name Profile.all.select do |p| p.country.present? && p != current_user.profile end end，但下一行失败，因为您尝试在该布尔值上调用def method_name Profile.where.not(user_id: current_user.id).where.not(country: nil) end。

解决问题的一种方法可能是修复你的代码：

Nov 26, 2015 5:35:06 PM org.apache.hive.jdbc.HiveConnection openSession
SEVERE: Error opening session
org.apache.thrift.TApplicationException: Required field 'client_protocol' is unset! Struct:TOpenSessionReq(client_protocol:null, configuration:{use:database=ms})
    at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
    at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
    at org.apache.hive.service.cli.thrift.TCLIService$Client.recv_OpenSession(TCLIService.java:156)
    at org.apache.hive.service.cli.thrift.TCLIService$Client.OpenSession(TCLIService.java:143)
    at org.apache.hive.jdbc.HiveConnection.openSession(HiveConnection.java:583)
    at org.apache.hive.jdbc.HiveConnection.<init>(HiveConnection.java:192)
    at org.apache.hive.jdbc.HiveDriver.connect(HiveDriver.java:105)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at it.eng.spagobi.tools.datasource.service.rest.TestConnection.testDataSource(TestConnection.java:92)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
    at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211)
    at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

it.eng.spagobi.tools.datasource.service.rest.TestConnection.testDataSource: Error testing datasources
java.sql.SQLException: Could not establish connection to jdbc:hive2://cosmos.lab.fiware.org:10000/ms: Required field 'client_protocol' is unset! Struct:TOpenSessionReq(client_protocol:null, configuration:{use:database=ms})
    at org.apache.hive.jdbc.HiveConnection.openSession(HiveConnection.java:594)
    at org.apache.hive.jdbc.HiveConnection.<init>(HiveConnection.java:192)
    at org.apache.hive.jdbc.HiveDriver.connect(HiveDriver.java:105)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at it.eng.spagobi.tools.datasource.service.rest.TestConnection.testDataSource(TestConnection.java:92)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
    at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211)
    at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.thrift.TApplicationException: Required field 'client_protocol' is unset! Struct:TOpenSessionReq(client_protocol:null, configuration:{use:database=ms})
    at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
    at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
    at org.apache.hive.service.cli.thrift.TCLIService$Client.recv_OpenSession(TCLIService.java:156)
    at org.apache.hive.service.cli.thrift.TCLIService$Client.OpenSession(TCLIService.java:143)
    at org.apache.hive.jdbc.HiveConnection.openSession(HiveConnection.java:583)
    ... 39 more

另一种方式 - 我最喜欢的方法 - 只是从数据库中加载匹配的记录：

返回除当前用户之外的所有用户配置

2 个答案: