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Questions tagged [value-objects]

A value object is a fundamental concept of domain modeling in Domain-Driven Design.

A value object is a fundamental concept of domain modeling in Domain-Driven Design.

As defined by Eric Evans in his book, Domain-Driven Design: Tackling Complexity in the Heart of Software:

An object that represents a descriptive aspect of the domain with no conceptual identity is called a VALUE OBJECT. VALUE OBJECTS are instantiated to represent elements of the design that we care about only for what they are, not who or which they are.

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Mapping suggestion for a possibly shared foreign key (value object in entity) in Entity Framework 4.1?

I have a Project entity and an Rfi entity. The project entity contains a list of TeamMembers. Project is a navigation property in the Rfi entity. In the Rfi entity there is a RecipientId. This Id represents a person from the TeamMembers collection.…
DDiVita
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How to implement a model using null-object pattern

I have a value object and an entity that uses said value object. I'm using the null-object pattern for said value object. My value object looks something like the following: public class Reference { public static Reference Empty; private string…
Fernando Gómez
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ActionScript: Constructor for Value Object classes

Is it OK to use the constructor to set properties for a value object class or must I use dot notation and set each one, one-by-one? I recently read an article that was saying I should do it one-by-one as value objects should only contain properties…
Francisc
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DDD - Entity vs ValueObject

I was reading about DDD and I realize that sometimes an entity might be a VO or VO might be an entity. You can know which one is better depends on the context. I was checking different examples. For example, shopping cart DDD example. Product is an…
wipcrep
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Which layer should Value-Object be used?

In the following example shows a query to get an employ details. It has a int parameter Id. And there is a DTO class EmployeeDto which also has a field Id with type of…
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The performance issue of validating entity using value object

I have the following value object code which validates CustCode by some expensive database operations. public class CustCode : ValueObject { private CustCode(string code) { Value = code; } public static Result…
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ValueObject json deserialization returns Null

I am trying to implement valueobject in asp.net core with ef core. I have money as value object and product which has money as price property. The problem is that money is serialized in product table but deserialization returns null. I tried debug…
Bita Khodakarami
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Currency is value object or not

I have Person aggregate, which is root aggregate public class Person { private int id; private readonly PersonID personID; private readonly string email; private readonly string firstName; private readonly string lastName; …
kamal
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Should uniqueness be ignored when deciding if something is an Entity or Value Object?

Is uniqueness considered a persistence concern in DDD? The reason I ask is because I have a Customer object in an order quoting context. e.g. an order is for a customer and the customer must pay a certain rate. Technically, I won't allow a customer…
peefartpoop
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Accessing a JSON value that references another JSONs key

I have two JSON files and one references the other. The first file below is parsed into the program as moves, it's referencing into a spritesheet. {"stand": { "x": 0, "y": 12, "width": 49, "height": 52 }, "walk1": { "x": 52, "y": 12, "width": 50,…
Hellonearthis
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Why my Zend-HAL implementation is not working with protected values

I am new in Zend framework, and trying to use HAL for API response generation. In the following is a simpler situation of my issues. The class: class Version { protected $data; public function __construct($ar){ $data = $ar; } …
Md Monjur Ul Hasan
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Updating Value objects or Inserting new Record in DB

I have a Ticket table and its Receivers which is a collection. Receiver is a value object. I defined all in EF Core 2.2 and everything is Okay. When inserting a new ticket, receivers are added to ticket and would be saved. For updating ticket, as…
unos baghaii
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Is it a good idea to model keywords as value object in Product aggregate?

I have product aggregate which has several keywords to help for searching products. I have modeled it as following: public class Product : Entity , IAggregateRoot { public Guid AccountId { get; protected set; } public string…
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DDD - Mapping Value Objects with Fluent nHibernate in separate tables

EDIT: Hi, trying an edit to get this question answered. In order to try improve the question, here is a straight to the point condensed version: Is the code below the way to go when mapping value objects to separate tables using fluent nhibernate,…
gdp
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Constraint on Value Object in form Symfony

I'm quite new to Symfony and I started digging around Symfony forms. As described here https://webmozart.io/blog/2015/09/09/value-objects-in-symfony-forms/ I'm using value objects in my subform. A constructor of value object can throw an exception…
micah
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