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POPartial Updates for Entities with Repository/DTO patterns in MVC (prepping for API)
 

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  1. POPartial Updates for Entities with Repository/DTO patterns in MVC (prepping for API)
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    <p>I've built my Domain model layer, my repository layer, and now I'm working on my DTO layer to be used by a webApi project. I'm in the middle of implementing an Update service method, and I'm wondering about partial updates. Here's my DTO class: </p> <pre><code>public class FullPersonDto { public FullPersonDto() { Friends = new List&lt;Person&gt;(); } public FullPersonDto(Person person) { PersonId = person.PersonId; DateCreated = person.DateCreated; Details = person.Details; Friends = new List&lt;Person&gt;(); foreach (Person friend in person.Friends) { Friends.Add(new PersonDto(friend)); } } [Key] public int PersonId { get; set; } [Required] public virtual DateTime DateCreated { get; set; } public virtual string Details { get; set; } public List&lt;Person&gt; Friends { get; set; } public Person ToEntity() { var person = new Person { PersonId = PersonId, DateCreated = (DateTime) DateCreated, Details = Details, Friends = new List&lt;Person&gt;() }; foreach (PersonDto friend in Friends) { person.Friends.Add(friend.ToEntity()); } return person; } } </code></pre> <p>Here's my Update method in my Repository: </p> <pre><code>public Person UpdatePerson(Person person) { var entry = _db.Entry(person); if (entry.State == EntityState.Detached) { var dbSet = _db.Set&lt;Person&gt;(); Person attachedPerson = dbSet.Find(person.PersonId); if (attachedPerson != null) { var attachedEntry = _db.Entry(attachedPerson); attachedEntry.CurrentValues.SetValues(person); // what if values are null, like ID, or DateCreated? } else { entry.State = EntityState.Modified; } } SaveChanges(); return person; } </code></pre> <p>My question is: What if I only need to update the Details of a person via my webAPI? Is the convention to construct an entire PersonDto and Update the entire object using SetValues, or is there any way I can specify that I only want a single field updated so that I don't have to send a ton of data over the wire (that I don't really need)? </p> <p>If it <em>is</em> possible to do partial updates, when is it ever good to update the entire entity? Even if I have to update 5/7 properties, it requires that I send old data for 2/7 to re-write so that SetValues doesn't write nulls into my fields from my DTO. </p> <p>Any help here would be awesome... totally new to this stuff and trying to learn everything right. Thank you. </p>
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    1. COAre you calling your WebAPI from a standard MVC app?
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    2. COYes! Does that help? Though I don't think I can make the assumption that every client application will.
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