scaffold | 易学教程

代码优先与模型/数据库优先[关闭]

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 使用实体框架4.1代码优先于模型/数据库优先使用EDMX图表有什么优缺点？我正在尝试完全理解使用EF 4.1构建数据访问层的所有方法。我正在使用Repository模式和 IoC 。我知道我可以使用代码优先方法：手动定义我的实体和上下文，并使用 ModelBuilder 来微调模式。我还可以创建 EDMX 图并选择使用T4模板生成相同 POCO 类的代码生成步骤。在这两种情况下，我最终都得到了与 ORM 无关的 POCO 对象和源自 DbContext 上下文。数据库优先似乎最吸引人，因为我可以在企业管理器中设计数据库，快速同步模型并使用设计器对其进行微调。那么这两种方法有什么区别？是仅仅关于VS2010与企业管理器的偏好？ #1楼代码优先似乎是后起之秀。我快速浏览了Ruby on Rails，它们的标准是代码优先，具有数据库迁移。如果您正在构建MVC3应用程序，我相信Code首先具有以下优势：简单的属性修饰 - 您可以使用验证，要求等属性来装饰字段，这对于EF建模来说非常尴尬没有奇怪的建模错误 - EF建模通常会出现奇怪的错误，例如当您尝试重命名关联属性时，它需要匹配底层的元数据 - 非常不灵活。合并并不尴尬 - 当使用像mercurial这样的代码版本控制工具时，合并

Does rails scaffold command support generate belongs_to or many to many model middle table migration info?

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问题 Product,Category is two model on rails3 the relation between them are follow: product has_and_belongs_to_many categories category has_and_belongs_to_many products i can use scaffold generate migration for this two modle use rails g scaffold product name:string rails g scaffold category name:string but how can i generate the many to many model's middle table migration info,or i need write it manually,if so this is hard for me,hope someone could help me. 回答1: You need create this table by

Does rails scaffold command support generate belongs_to or many to many model middle table migration info?

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How to have the scaffold to generate another partial view template file

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问题 I'm trying to customize my scaffold generator , and I would like to have a new partial for the view in the same directory, in particular _item to be called both inside index and show . I can get all the templates but I'm not able to generate this file through rails g scaffold foo name:string I tried to put _item.erb in /lib/templates/erb/scaffold/ (together with the other files) but it is ignored- Does anybody have a clue? I use ruby on rails 3, but please let me know if the solution is valid

rails g scaffold for existing model and DB table

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问题 I would like to create a structure with rails g scaffold Article , but I have already created the table Articles and model Articles . Is there any way to do that? 回答1: rails generate scaffold_controller Article 回答2: Use rails generate scaffold_controller Article with parameters, example: rails g scaffold_controller Article title:string body:text Create views with attributes in tables 来源： https://stackoverflow.com/questions/9808668/rails-g-scaffold-for-existing-model-and-db-table

“ undefined method `enumerable_enumerator_path' ” error

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问题 I'm using basic scaffold structure. What I need, is to add 'moderate' action and view by changing published to true . In my idea, on moderate.html I should get the list of all unpublished entries with the ability to change and save their parameters. Here are parts of my code: #names_controller.rb def moderate @name = Name.find(:all, :conditions => {:published => false} ) respond_to do |format| format.html format.xml end end #moderate.html.erb <% form_for @name.each do |f| %> <%= f.error

ASP.NET MVC 5 Model-Binding Edit View

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问题 I cannot come up with a solution to a problem that's best described verbally and with a little code. I am using VS 2013, MVC 5, and EF6 code-first; I am also using the MvcControllerWithContext scaffold, which generates a controller and views that support CRUD operations. Simply, I have a simple model that contains a CreatedDate value: public class WarrantyModel { [Key] public int Id { get; set; } public string Description { get; set; } DateTime CreatedDate { get; set; } DateTime

Error when trying to Scaffold a model

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问题 I'm building a Razor Page app using ASP.NET 2017. When I run the command dotnet aspnet-codegenerator razorpage -m Activity -dc CongContext -udl -outDir Page\Activities --referenceScriptLibraries This error appears: Could not load file or assembly 'Microsoft.EntityFrameworkCore, Version=2.0.3.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) I stopped and restarted VS, I

Need to create a foreign key when creating a table on Rails?

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问题 i'm starting now on Rails, i looked in the forum, but i didn't find anything that could solve my problem. Here it goes, I have a Category table, and it has only name for a column (there is no repetition in categories) so i would like name to be the primary key, then i have a Product table that has name, main_photo, description and i would like to say that a product only has a category, do i need to add a column named category as a foreign key in products? A Category is suposed to have many

dynamic_matchers.rb:55:in `method_missing': undefined method `migration_error=' for ActiveRecord::Base:Class (NoMethodError)

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问题 I'm on Windows. Ruby v.1.9.3p392 / Rails v. 3.2.13 - This is the demo_app project from the 2nd chapter of Michael Hart's Ruby on Rails Tutorial. This error comes up when I issue ' rails generate scaffold User name:string email:string ' Any idea how to fix this? C:\ruby\rails_projects\demo_app>rails generate scaffold User name:string email:s tring invoke active_record C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/act ive_record/dynamic_matchers.rb:55:in `method