ruby

Rails Collection_Select Has_Many Through

由 て烟熏妆下的殇ゞ 提交于 2021-02-08 06:13:22
问题 I have a user that has many accounts. I want to use a collection_select to have the user select which account they want to use. The select need to select among all the accounts assigned to the user in the user_accounts table, but the select needs to check the accounts table to get the name of the account that the drop down menu needs to display. #user.rb class Account < ActiveRecord::Base cattr_accessor :current_id belongs_to :owner, class_name: 'User' has_many :user_accounts has_many :users,

Rails Collection_Select Has_Many Through

由 旧巷老猫 提交于 2021-02-08 06:03:33
问题 I have a user that has many accounts. I want to use a collection_select to have the user select which account they want to use. The select need to select among all the accounts assigned to the user in the user_accounts table, but the select needs to check the accounts table to get the name of the account that the drop down menu needs to display. #user.rb class Account < ActiveRecord::Base cattr_accessor :current_id belongs_to :owner, class_name: 'User' has_many :user_accounts has_many :users,

Rails: Many to many relation to self

由 允我心安 提交于 2021-02-08 05:42:07
问题 I am having problems creating this association: Consider a model "Entry". I want entries to have many entries as parents and I want entries to have many entries as children. I want to realize this relation via a model I called "Association", so here is what I tried: Migration: class CreateAssociations < ActiveRecord::Migration[5.0] def change create_table :associations do |t| t.integer :parent_id t.integer :child_id end end end Association model: class Association < ApplicationRecord belongs

Knative入门系列6：Knative的使用

由 笑着哭i 提交于 2021-02-08 05:15:31
作者：Brian McClain & Bryan Friedman 译者：殷龙飞 审校：孙海洲、邱世达、王刚、宋净超 Knative 是一个基于 Kubernetes 的，用于构建、部署和管理现代 serverless 应用的平台。Getting Started with Knative 是一本由 Pivotal 公司赞助 O’Reilly 出品的电子书，公众号后台回复“ knative ”获取英文版下载地址。本书中文版由 ServiceMesher 社区自发翻译系列文章，这是该系列的第6章。 通过前面的章节已经扎实掌握 Knative 的组件了，现在是时候开始研究一些更高级的主题了。Serving 为如何路由流量提供了相当大的灵活性，还有其他的构建模板使构建应用程序变得容易。只需几行代码即可轻松制作我们自己的事件源。在本章中，我们将深入研究这些功能，让我们的代码在 Knative 上更容易地运行。 创建和运行 Knative Services 第 2 章 介绍了 Knative Service 的概念。 回想一下，Knative 中的 Service 是单个配置和路由集合的组合。在 Knative 和 Kubernetes 体系内，它最终是 Pod 中的 0 个或多个容器以及其他使您的应用程序可寻址的组件。所有这些都由具有强大流量策略选项的路由层支持。

Automatically add a subclass to registry

由 本秂侑毒 提交于 2021-02-08 03:32:48
问题 For each subclass of the BaseStrategy being declared, I want to add them to the BaseStrategy.strategies array to be used later. What I can do is add class method BaseStrategy.register_strategy and call it in each subclass. But this would be error prone. Instead, I want BaseStrategy.register_strategy automatically invoked if a new subclass of BaseStrategy being declared. How can I do that? 回答1: Use inherited hook: class BaseStrategy class << self def inherited(klass) register_strategy(klass)

Automatically add a subclass to registry

由 你。 提交于 2021-02-08 03:31:01
问题 For each subclass of the BaseStrategy being declared, I want to add them to the BaseStrategy.strategies array to be used later. What I can do is add class method BaseStrategy.register_strategy and call it in each subclass. But this would be error prone. Instead, I want BaseStrategy.register_strategy automatically invoked if a new subclass of BaseStrategy being declared. How can I do that? 回答1: Use inherited hook: class BaseStrategy class << self def inherited(klass) register_strategy(klass)

how to make a deep_slice in a hash on ruby

由 喜你入骨 提交于 2021-02-08 03:26:52
问题 I was looking around for a clean way to do this and I found some workarounds but did not find anything like the slice (some people recommended to use a gem but I think is not needed for this operations, pls correct me if I am wrong), so I found myself with a hash that contains a bunch of hashes and I wanted a way to perform the Slice operation over this hash and get also the key/value pairs from nested hashes, so the question: Is there something like deep_slice in ruby? Example: input: a = {b

how to make a deep_slice in a hash on ruby

由 浪子不回头ぞ 提交于 2021-02-08 03:26:50
问题 I was looking around for a clean way to do this and I found some workarounds but did not find anything like the slice (some people recommended to use a gem but I think is not needed for this operations, pls correct me if I am wrong), so I found myself with a hash that contains a bunch of hashes and I wanted a way to perform the Slice operation over this hash and get also the key/value pairs from nested hashes, so the question: Is there something like deep_slice in ruby? Example: input: a = {b

Store functions in hash

由 孤者浪人 提交于 2021-02-08 02:10:51
问题 I know that in Ruby you can create hash maps like this: hash = {"name"=>"John"} But is it possible to have a hash map of methods: hash = {"v"=> show_version} and when calling hash["v"] either to execute the show_version function, or to return some kind on pointer that passed to some special method, to execute the function from the hash? What I am trying to achieve, is to have a hash map of methods, instead of using a case/when construction, as it looks too verbose to me. 回答1: Not exactly like

Store functions in hash

由 不打扰是莪最后的温柔 提交于 2021-02-08 02:05:54
问题 I know that in Ruby you can create hash maps like this: hash = {"name"=>"John"} But is it possible to have a hash map of methods: hash = {"v"=> show_version} and when calling hash["v"] either to execute the show_version function, or to return some kind on pointer that passed to some special method, to execute the function from the hash? What I am trying to achieve, is to have a hash map of methods, instead of using a case/when construction, as it looks too verbose to me. 回答1: Not exactly like
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