DevForce Community Forum : Include navigations in a loaded object

Include navigations in a loaded object : Ok, I changed my business logic...

Thu, 16 May 2013 05:41:23 -700

Author: cefernan
Subject: 4144
Posted: 16-May-2013 at 5:41am

Ok, I changed my business logic to receive IDs instead of entities.

Thank you Marcel.

Include navigations in a loaded object : ViewModels and business logic...

Tue, 14 May 2013 18:22:31 -700

Author: mgood
Subject: 4144
Posted: 14-May-2013 at 6:22pm

ViewModels and business logic are best written such that they ensure all the required data is loaded instead of trusting an entity that is passed from the outside. You can help this by passing IDs instead of entities.

There are several ways you can accomplish this. The easiest is taking advantage of the query cache in DevForce. If a ViewModel or business logic requests some data and the data has been previously loaded using the same query, the data automatically comes from the cache and it won't round-trip to the server.

Include navigations in a loaded object : Let's go.I have a class allocated...

Mon, 13 May 2013 05:53:31 -700

Author: cefernan
Subject: 4144
Posted: 13-May-2013 at 5:53am

Let's go.

I have a class allocated in a different project that receive an object (entity) by parameter and do some business logic. In this code, I need this object and some navigations of this object. If the programmer forget to include the navigations before pass the object to this method, my code will fail. So, to ensure that my code will work, I receive the object and include the navigations in my method.

To do this I've created this extension method:

public static async Task GetSingleEntityGraphAsync(this EntityManager manager, T entity, Action<IFetchOptions> fetchOptions, QueryStrategy strategy = null) where T : Entity{    IEntityQuery query = entity.ToQuery();     if (fetchOptions != null)    {        var options = new FetchOptions(query);        fetchOptions(options);        query = options.Query;    }     if (strategy != null)        query.With(strategy);     var result = await manager.ExecuteQueryAsync(query);    return result.Single();}

In my business logic:

...

    // Load necessary data of campaign    Campaign = await EntityManager.GetSingleEntityGraphAsync<Campaign>(Campaign, f => f        .Include(i => i.CampValues).Include(i => i.CampPrizes));

...

But, to create this extension method, I needed to declare my own FetchOptions.

Is it good strategy or do you suggest something better?

Include navigations in a loaded object : I think I need some more background...

Sat, 11 May 2013 04:08:23 -700

Author: mgood
Subject: 4144
Posted: 11-May-2013 at 4:08am

I think I need some more background to answer this question.

Include navigations in a loaded object : Hi,I have a loaded object (entity)...

Thu, 09 May 2013 07:35:29 -700

Author: cefernan
Subject: 4144
Posted: 09-May-2013 at 7:35am

Hi,

I have a loaded object (entity) and now, in another context, I need to include some navigations of this entity.

How is the best way to do that?