Databases
StackOverflow2013
Postsdbo
POC# MongoDB: How to correctly map a domain object?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC# MongoDB: How to correctly map a domain object?
    primarykey
    data
    text
    <p>I recently started reading Evans' Domain-Driven design book and started a small sample project to get some experience in DDD. At the same time I wanted to learn more about MongoDB and started to replace my SQL EF4 repositories with MongoDB and the latest official C# driver. Now this question is about MongoDB mapping. I see that it is pretty easy to map simple objects with public getters and setters - no pain there. But I have difficulties mapping domain entities without public setters. As I learnt, the only really clean approach to construct a valid entity is to pass the required parameters into the constructor. Consider the following example:</p> <pre><code>public class Transport : IEntity&lt;Transport&gt; { private readonly TransportID transportID; private readonly PersonCapacity personCapacity; public Transport(TransportID transportID,PersonCapacity personCapacity) { Validate.NotNull(personCapacity, "personCapacity is required"); Validate.NotNull(transportID, "transportID is required"); this.transportID = transportID; this.personCapacity = personCapacity; } public virtual PersonCapacity PersonCapacity { get { return personCapacity; } } public virtual TransportID TransportID { get { return transportID; } } } public class TransportID:IValueObject&lt;TransportID&gt; { private readonly string number; #region Constr public TransportID(string number) { Validate.NotNull(number); this.number = number; } #endregion public string IdString { get { return number; } } } public class PersonCapacity:IValueObject&lt;PersonCapacity&gt; { private readonly int numberOfSeats; #region Constr public PersonCapacity(int numberOfSeats) { Validate.NotNull(numberOfSeats); this.numberOfSeats = numberOfSeats; } #endregion public int NumberOfSeats { get { return numberOfSeats; } } } </code></pre> <p>Obviously automapping does not work here. Now I can map those three classes by hand via <code>BsonClassMaps</code> and they will be stored just fine. The problem is, when I want to load them from the DB I have to load them as <code>BsonDocuments</code>, and parse them into my domain object. I tried lots of things but ultimately failed to get a clean solution. Do I really have to produce DTOs with public getters/setters for MongoDB and map those over to my domain objects? Maybe someone can give me some advice on this.</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. UShoetz
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POC# MongoDB: How to correctly map a domain object?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC# MongoDB: How to correctly map a domain object?
      1. USSunny Milenov
      1. VTFavorite
    3. VO
      singulars
      1. POC# MongoDB: How to correctly map a domain object?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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