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Questions tagged [aggregateroot]

A cluster of associated objects that are treated as a unit for the purpose of data changes. External references are restricted to one member of the Aggregate, designated as the root. A set of consistency rules applies within the Aggregate's boundaries.

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AggregateRoot and Children

one aspect of AggregateRoots with children is not 100% clear to me. And I also found no complete example via Google. Let's say I have an AggregateRoot "Customer". A customer can have multible projects. I already learned that I have just one…
SharpNoiZy
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DDD: is accessing repository from aggregate root considered bad practice?

I've read that accessing repository from aggregate root considered bad practice. If it is, than consider following example: class User { private String username; public void changeUsername(String newUsrname) { // How will I persist…
Teimuraz
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How to "query" the aggregate to see if a command can be executed

I have an email draft as a aggregate root with the following commands: addToRecipient, addCcRecipient, addBccRecipient, updateBodyText, uploadAttachment, removeAttachment and in the UI I want to disable the SEND button if the draft is not ready to…
Constantin Galbenu
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DDD suggest a relation between entities

I have a following structure. Resources can have multiple endpoints. Example: Resource tickets can be accessed on following endpoints: /api/tickets /api/agent/tickets /api/group/5/tickets /api/tickets/closed etc. At first, this looks like…
Robert
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Using Domain Events to Update Entity in Database

I have a PurchaseOrder aggregate root which has Two methods FinalizeOrder and CancellOrder, they both record events: OrderFinaziled and OrderCancelled. I am stuck on modeling order repository, can i use those events inside repository pattern to…
QuietNaN
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DDD: How many Aggregate roots do I need?

I am a little confused with the Aggregate root concept in DDD. The theory tells then it should be an aggregate root which is relevant to the current operation. For example, I have a root Account, which represents a company. It has Address, Users…
Yaplex
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How can a child of an aggregate root use values from another aggregate root

For example, consider a store having multiple menus. Menus list items and one item can be listed in multiple menus. Imagining a Menu aggregate root and Item aggregate root. A Menu would have a collection of MenuItem's who reference an Item AR along…
user3228313
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Should every object be modeled as aggregates, entities or value objects in DDD?

I am employing DDD (including domain events) and CQRS (without Event Sourcing) in the design of a social network website. I have aggregate roots like User, FriendRequest, Friendship. I also have domain events like UserAddressChanged,…
foresightyj
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Unit Testing a Domain Model Containing Lists Populated From The Database

I am currently in the middle of writing unit tests for my domain models. To lay a bit of context I have a Role Group class which has a list of Roles, it also has a list of Users that currently have this Role Group assigned to them. A Role Group is…
user1866606
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Domain driven design methods in aggregate

My question is in regards to the following: If I have a class that manages users, lets call it UserManager. Should it be responsible for updating users in the database (something like RegisterUser, UpdateUser methods which uses a repository…
user2153675
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How to reference AggregateRoot internal entity data in DDD

I'm interested in the Idea of DDD but I have some questions about the concept of encapsulating and protecting the AggregateRoot internal Entities and how to reference them. I created a simple example (don't hit me if the domain design is bad, this…
Beachwalker
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DDD Every Entitys seems fit inside one aggregate

I'm implementing a college system, and I'm trying to use DDD. I'm also reading the blue book. The basics entities of the system are Institution, Courses, Professors and Students. This system will allow a lot of Institutions, each having its courses,…
Rodrigo Otavio
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DDD: Quering child objects of aggregate root

If I have understood right, in domain driven design there are repositories for only aggregate root objects. So what is the right way to implement, for example, paging (or access control filtering) for those objects which are child objects of roots.…
Toni
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DDD aggregate roots design for a relation that have internal types

Lets say that i have an aggregate root named User the user can have multiple Vehicle, the Vehicle entity has types such as (suv, truck, sedan, etc ...). In that case if i want to get the User vehicles of type sedan only do i have to design my…
AboElzooz
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NHibernate : Root collection with an root object

I want to track a list of root objects which are not contained by any element. I want the following pseudo code to work: using (session1 = [...]) { IListlist =…
Daniel
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