我有两个NSOperation负责下载和解析.下载操作成功后,我收到一些NSData,然后我想将该数据设置为解析操作使用的数据:
init(context: NSManagedObjectContext, completionHandler: Void -> Void) {
downloadOperation = DownloadActivitiesOperation() { data in
self.parseOperation.data = data
}
parseOperation = ParseActivitiesOperation(context: context)
let finishOperation = NSBlockOperation(block: completionHandler)
parseOperation.addDependency(downloadOperation)
finishOperation.addDependency(parseOperation)
super.init(operations: [downloadOperation, parseOperation, finishOperation])
name = "Get Activities"
}
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然而,这不起作用,因为我self在调用之前尝试在我的下载完成块中使用super.init.
我的问题是,当尝试将一个操作的结果传递给链中的下一个操作时,最好的方法是什么?
我正在尝试bundle update在我的rails应用程序上执行,但是我收到以下错误:
Installing ffi (1.0.11) with native extensions Unfortunately, a fatal error has occurred. Please report this error to the Bundler issue tracker at https://github.com/carlhuda/bundler/issues so that we can fix it. Thanks!
/Users/Kyle/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:552:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
/Users/Kyle/.rvm/rubies/ruby-1.9.3-p125/bin/ruby extconf.rb
checking for ffi.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You …Run Code Online (Sandbox Code Playgroud) 我试图从Linux服务器访问oracle.我正在使用unixODBC.
当我尝试使用isql访问oracle时,我得到错误,驱动程序管理器无法打开libsqora.so.12.1.
ODBC.INI
[NAME]
Application Attributes = T
Attributes = W
BatchAutocommitMode = IfAllSuccessful
BindAsFLOAT = F
CloseCursor = F
DisableDPM = F
DisableMTS = T
Driver = Oracle 11g ODBC driver
DSN = DSN_NAME
EXECSchemaOpt =
EXECSyntax = T
Failover = T
FailoverDelay = 10
FailoverRetryCount = 10
FetchBufferSize = 64000
ForceWCHAR = F
Lobs = T
Longs = T
MaxLargeData = 0
MetadataIdDefault = F
QueryTimeout = T
ResultSets = T
ServerName = ServerName
SQLGetData extensions = F …Run Code Online (Sandbox Code Playgroud) 我正在尝试使用jest(v20.0.0)w /我的React Native应用程序(v0.42.0)但是当我运行时,yarn jest我收到以下错误:
yarn jest v0.27.5
$ jest
FAIL __tests__/routing/router-test.js
? Test suite failed to run
Cannot find module 'ReactNative' from 'react-native.js'
at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:179:17)
at Object.<anonymous> (node_modules/react-native/Libraries/react-native/react-native.js:188:25)
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这是jest我的一部分package.json
"jest": {
"testPathIgnorePatterns": [
"/node_modules/"
],
"transformIgnorePatterns": [
"node_modules/(?!react-native|react-native-geocoding)/"
],
"globals": {
"__DEV__": false
},
"collectCoverage": false
},
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这是失败的测试文件(我删除了除了之外的所有内容,import并且错误仍然存在).
import 'react-native';
import React from 'react';
describe('Router', () => {
});
Run Code Online (Sandbox Code Playgroud) 我正在尝试设置Laravel PHP框架以与Nginx一起使用.这是我的目录结构:
/project
/application
/laravel
/public
index.php
/legacy
/index.php
/stylesheets
default.css
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基本上我所拥有的是标准的Laravel下载w/legacy文件夹,其中包含我的非MVC项目中的所有文件.
我需要Nginx首先检查所请求的页面/文件是否存在于遗留内部,如果确实存在,那么我想使用它.否则,我想回到index.php位于的Laravel 文件中project/public/.
在Nginx配置方面,我不是专家,因此您可以提供的任何帮助都将非常受欢迎.
我刚刚将我的应用程序升级到最新版本的rails(3.1)并且我想将Twitter的Bootstrap集成到我的应用程序中,但它使用LESS而不是SASS,这是Rails 3.1默认使用的.
如何配置Rails以使用Less而不是Sass?
如何在模型中访问Devises的current_user'对象?我想在创建内容时自动将当前用户ID附加到记录中.我知道我可以手动设置控制器内部的user_id,但我觉得如果模型处理它会更容易/更清洁.
我的模型age上有一个方法Waiver,如下所示:
def age(date = nil)
if date.nil?
date = Date.today
end
age = 0
unless date_of_birth.nil?
age = date.year - date_of_birth.year
age -= 1 if date < date_of_birth + age.years #for days before birthday
end
return age
end
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然后,我有一个看起来像这样的规范:
it "calculates the proper age" do
waiver = FactoryGirl.create(:waiver, date_of_birth: 12.years.ago)
waiver.age.should == 12
end
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当我运行这个规范时,我得到了comparison of Date with ActiveSupport::TimeWithZone failed.我究竟做错了什么?
Failures:
1) Waiver calculates the proper age
Failure/Error: waiver.age.should == 12
ArgumentError:
comparison of …Run Code Online (Sandbox Code Playgroud) 我目前有一段代码如下:
if match = request.path.match(/\A\/(?<slug>(?!admin|assets)\w+)/)
match[:slug]
end
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有没有办法使用安全导航操作符(在2.3.0中引入)来避免这种if条件?
我正试图让我的应用程序与Travis CI一起工作,但我一直在:FATAL: role "skateparks" does not exist.关于我可能做错的任何想法?我跟着他们的文件.
ruby ×3
bundler ×1
devise ×1
ffi ×1
ios ×1
ios9 ×1
javascript ×1
jestjs ×1
laravel ×1
less ×1
linux ×1
nginx ×1
nsoperation ×1
oracle ×1
oracleclient ×1
php ×1
postgresql ×1
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swift ×1
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