I am using Entity Framework Model First. There are 2 entities in my Model..
User
Role
I want to use MVC scaffolding (using VS 2012 or 2010) for this relationship.
From some posts in 20111 many-many was not supported. is it still not supported? If nto supported is there any workaround?
I can not change the Model (because database will be generated from it) however i am mainly looking forward creating Users, Creating Roles and Assigning roles to Users. if some workaround using one-many can give me above scaffolded views and controller I will be ok with that.
Thanks
Nachi
Related
I am working in ASP.NET MVC 5 with Entity Framework 6.1 in Database First approach.
I starting create Models Class response to each Entity (the tables of database),
I feel it is boring task and found that Entity Framework almost done for me.
I expand the *.edmx file and then expand *.tt file, there are many class there and 90% similar to my hand made models.
So I start search on Google to see what is the best practice to generate models in smart way. Finally, the following 2 ways I found.
1. Copy all the class corresponding to each database's table to Models folder and remove this line:
System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
2. Using EF 6.1 Wizard - Code First from Database
Which similar to method 1 but come with addition DataAnnotations.
There is a 3rd method recommended by Microsoft Doc,
Generate the Context with Models inside Models folder and work with, the most simple way, but we know this is the worst one.
So Which method I mention above is proper way to create models?
Data base First approach is the best way to create model classes but u don't want annotations for model class at this time you may select 'EF Designer from Database' option from EF wizard choose model step
I'm Developing ASP.NET MVC Web Application project, and I'm using Entity Framework Database First Approach, So I would like to make validations on generated model classes, I know if i make validations on them directly, then my model validations will be overwritten every time my domain models are regenerated.
So I made a research, and found two approaches to use for this scenario:
1- Using buddy classes (How to add validation to my POCO(template) classes).
2- Using ViewModels and Auto-mapping them to my Entities (Designing an MVC repository using ViewModels
I see some sort of redundant code in these two methods, so, my question is:
Which one of the two approaches is best to flow?
1) This is the correct solution for adding validation metadata for the Entity Framework objects. The validation will be triggered automatically by EF before calling SaveChanges()
2) This is an aproach for creating Data Transfer Objects from your EF objects. You normally do this when you want to return the objects to the client (like in JSON format) - and you don't want to expose all the EF specific properties (like navigation properties, primary keys etc)
I use MVC 4 Internet Application with VS 2012 and Entity (5.0) Framework Database First..
I created my database with relationships..
I create ADO.NET Entity Data Model.. And I can see all relationships (one-to-one, one-to-many, many-to-many)..
I want to create my controller and views with "mvc controller with read/write actions and views using entity framework".. There is no problem with One-to-Many and One-to-One..
How about Many-to-Many??
You can reverse engineer your db.context from your database (if you have entity framework nuget package installed) by right clicking on your project->entity framework-> reverse engineer from code first.
To enable this option first install - Entity Framework Power Tools
Setup is fairly simple but a guide like this might help -> Setup Tutorial
This will automatically setup your database context maps as they are in your database.
The table maps created, contain the relationship code.
I have a many-to-many relationship in a table in my app and this works fine.
All problems, which are something like that, are about the ViewModels..
http://msdn.microsoft.com/en-us/vs2010trainingcourse_aspnetmvc3fundamentals_topic7.aspx
I am new to EF CodeFirst and trying to build relations between entities.
I've three tables and their relationship are as follows:
When I pass UserID I should get all the provider details of Organizations for which this user belongs to.
How to build the entities and their relations for this scenario in CodeFirst(fluent API) approach? I am using EF CodeFirst on existing database. So these three tables already exists in Database.
Any inputs or pointers will be appreciated. Thank you!
Use EF Power Tools. It has Reverse Engineer option that will create a model for an exisiting database. If you want to configure your model with fluent API instead of attributes you can use the above to get you to a starting point where you would manually convert whatever needs to be converted.
Let's say that I have following situation.
I have many customers and many consultans, and each customer has attached only one consultant. So it's one-to-many relationship.
I created Edit view which display customer_name and customer_consultant_id how should I update information after post? Just UpdateModel does not work, so something more is needed. Any ideas?
To get the data from your web page to the controller, have a look at this article from Scott Hanselman:
ASP.NET Wire Format for Model Binding to Arrays, Lists, Collections, Dictionaries
Those following two links seems to be completly answering my question:
ASP.NET MVC, Entity Framework, One-to-Many and Many-to-Many INSERTS
ASP.NET MVC, Entity Framework, Modifying One-to-Many and Many-to-Many Relationships