小编Tos*_*shi的帖子

我想知道如何使用该UIView属性clipsToBounds.

官方文档说明如下:

clipsToBounds 属性

一个布尔值,用于确定子视图是否仅限于视图的边界.

讨论
设置此值会YES导致子视图被剪切到接收器的边界.如果设置为NO,则不会剪切其帧超出接收器可见边界的子视图.默认值为NO.

但我不清楚这究竟意味着什么.我该怎么用clipsToBounds？将此属性设置为YES完全有什么后果？或者NO？

我无法弄清楚那些之间的区别.

• docker-compose up

• docker-compose up --build

• docker-compose build --no-cache

up没有缓存有没有命令？

我打开气流并检查连接,发现后面有太多的连接.任何想法如何杀死我不使用的,或者我想知道运行它的最小conn_id.

建筑

• LocalExecutor(没有任何其他经纪人)
• Postgres作为metadb

但它列出了17个连接.

这是连接列表.

这是airflow.cfg.

[core]
# Thee home folder for airflow, default is ~/airflow
airflow_home = /usr/src/app

# The folder where your airflow pipelines live, most likely a
# subfolder in a code repository
dags_folder = /usr/src/app/dags

# The folder where airflow should store its log files. This location
base_log_folder = /usr/src/app/logs

# Airflow can store logs remotely in AWS S3 or Google Cloud Storage. Users
# must supply a remote location URL (starting with …

我刚用宅基地做了laravel5环境.我做了"npm install",并得到了以下错误.

vagrant@homestead:~/Code/casts$ npm install

> node-sass@3.1.2 install /home/vagrant/Code/casts/node_modules/laravel-elixir/node_modules/gulp-sass/node_modules/node-sass
> node scripts/install.js

Binary downloaded and installed at /home/vagrant/Code/casts/node_modules/laravel-elixir/node_modules/gulp-sass/node_modules/node-sass/vendor/linux-x64-11/binding.node

> node-sass@3.1.2 postinstall /home/vagrant/Code/casts/node_modules/laravel-elixir/node_modules/gulp-sass/node_modules/node-sass
> node scripts/build.js

` /home/vagrant/Code/casts/node_modules/laravel-elixir/node_modules/gulp-sass/node_modules/node-sass/vendor/linux-x64-11/binding.node ` exists.
 testing binary.
Binary is fine; exiting.
npm ERR! EEXIST, open '/home/vagrant/.npm/9fb4c098-adable-stream-1-0-33-package-tgz.lock'
File exists: /home/vagrant/.npm/9fb4c098-adable-stream-1-0-33-package-tgz.lock
Move it away, and try again.

npm ERR! System Linux 3.16.0-23-generic
npm ERR! command "/usr/bin/node" "/usr/bin/npm" "install"
npm ERR! cwd /home/vagrant/Code/casts
npm ERR! node -v v0.10.33
npm ERR! npm -v 1.4.28
npm ERR! path /home/vagrant/.npm/9fb4c098-adable-stream-1-0-33-package-tgz.lock
npm ERR! …

使用Active Record,我们可以访问类似的值

方法访问

user = User.find(1)
user.name #=> 'John'

要么

哈希访问

user[:name] #=> 'John'

我只是想知道何时使用哪种,或者是否有最佳实践？我个人更喜欢method access因为我觉得这更像是红宝石.但是当我看到其他人的代码时,我会面对hash access.

好吧,我只是在应该使用惰性实例化时感到困惑.我理解懒惰实例化的基本概念.

"我理解所有属性在Objective-C中以nil开头,并且向nil发送消息不起作用,因此必须使用[[Class alloc] init]初始化;在向新创建的属性发送消息之前."(Lazy Objective-C/iPhone开发中的实例化)

m.file:

@property (strong, nonatomic) NSMutableArray *cards; 

- (NSMutableArray *)cards
{
    if (!_cards) _cards = [[NSMutableArray alloc] init];
    return _cards;
}

- (void)addCard:(Card *)card atTop:(BOOL)atTop
{
    if (atTop) {
        [self.cards insertObject:card atIndex:0];
    } else {
        [self.cards addObject:card];
} }

那么,我真的没有得到的是当我应该使用这种类型的实例化时？大多数情况下,我看到这样的代码:

h.file:

@interface Card : NSObject

@property (strong, nonatomic) NSString *contents;

m.file:

 if([card.contents isEqualToString:self.contents]){
        score = 1;
    }

*这可能是一个愚蠢的问题,但我真的很困惑.我是新来的,谢谢.

我一直在努力在 Intellij 上设置正确版本的 Ruby 解释器。

错误说：： Safe navigation operator requires at least Ruby 2.3

我明白错误在这里意味着什么。这意味着“此功能在您当前的 Ruby 版本中不可用。”

但是我不知道如何在 Intellij Build: 163.10154.41 中解决这个问题，事件我正确设置了 Ruby SDK。

本项目中使用的 Ruby 版本是 2.3.1，带有 rbenv。

我怎么能解决这个问题？

我创建了一个docker镜像,经过测试,用SSH登录容器.但是,当我尝试ssh到容器时,我被问到root密码.有任何想法来解决它.

Dockerfile

FROM ubuntu:trusty

RUN apt-get update

RUN apt-get install -y openssh-server supervisor vim build-essential git
RUN mkdir -p /var/run/sshd
ADD supervisord/sshd.conf /etc/supervisor/conf.d/sshd.conf
RUN echo 'root:root' | chpasswd

EXPOSE 22
CMD ["/usr/bin/supervisord"]

supervisord/sshd.conf

[supervisord]
nodaemon=true

[program:sshd]
command=/usr/sbin/sshd -D

我用

• Rail 4.2.5.1 在容器中运行
• Ruby 2.3.1 运行机智容器

当我开始

 $ docker-compose exec web /bin/bash # ssh into the web server
 $ bundle exec rails c 

我收到以下错误。

from /usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.13.1/lib/bundler/runtime.rb:86:in `each'
    from /usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.13.1/lib/bundler/runtime.rb:86:in `block in require'
    from /usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.13.1/lib/bundler/runtime.rb:75:in `each'
    from /usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.13.1/lib/bundler/runtime.rb:75:in `require'
    from /usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.13.1/lib/bundler.rb:106:in `require'
    from /usr/src/app/config/application.rb:7:in `<top (required)>'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:82:in `require'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:82:in `preload'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:143:in `serve'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application.rb:125:in `run'
    from /usr/local/bundle/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>'
    from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'

但是我已经把pqgem 放在了 …

我只是想知道rails如何使用JSON中的activemodel-serializer渲染模型对象.我安装了activemodel-serializer但是输出有所不同.

理想是这样的:

"products": [
  {
    "id": 1,
    "title": "Digital Portable System",

  },
  {
    "id": 2,
    "title": "Plasma TV",
  }

]

但到目前为止我得到的是;

我的代码很简单;

class Api::V1::ProductsController < ApplicationController
  before_action :authenticate_with_token!, only: [:create, :update, :destroy]
  respond_to :json

  def index
    respond_with Product.all  
  end

  def show
    respond_with Product.find(params[:id])   
  end

  def create
    product = current_user.products.build(product_params) 
    if product.save
      render json: product, status: 201, location: [:api, product] 
    else
      render json: { errors: product.errors }, status: 422
    end
  end

  def update
    product = current_user.products.find(params[:id])
    if product.update(product_params)
      render json: product, …