Databases
StackOverflow2013
Postsdbo
POAdding a custom property to my EF4 Model
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAdding a custom property to my EF4 Model
    primarykey
    data
    text
    <p>Let's say I have two tables in SQL that I want to have an EDMX model generated from (for now, going with automagical generation for everything) using POCO T4 templates. Let's say our two tables are <code>Person (ID, FName, LName)</code> and <code>Comment (ID, PersonID, CommentText, CommentDate)</code> with a one-to-many relation between the two (i.e. you can make many comments about one person).</p> <p>Getting my POCO entities generated from this is trivial and works beautifully. What I don't know how to do now, though, is to add a custom navigation property on my <code>Person</code> entity that represents the most recent comment for that person (eventually something even more complex than this will ultimately be needed). For now, it's okay that it's read-only but it would be nice to know how to handle an writable property too.</p> <p>What is the proper way to do this? One thing to consider is that I'm serializing these entities so I will need them to be eager-loaded and persisted in a way that I can push them out to my UI with WCF in the middle (i.e. a custom hand-written property in an extension class that relies on lazy loading is not an option).</p> <p>I've gotten pretty good at using EF4 for standard stuff, but now that I'm getting into this custom stuff, I'm not entirely sure how to do this in a best practice way.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USJaxidian
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAdding a custom property to my EF4 Model
      1. USabend
      1. VTFavorite
    1. COIdeally, I want to call `Person.LatestComment` and have that be the same as calling `Person.Comments.OrderByDescending(c => c.CommentDate).FirstOrDefault()`.
      singulars
      1. POAdding a custom property to my EF4 Model
      1. USJaxidian
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload