In my system, there are three main entities: Project, Attachment, and Messages. A project can have multiple attachments and messages associated with it.
The issue arises on the project detail view, where I display the project's messages and any attachments. Users can also add new attachments and post new messages. You can see a snapshot of this view here:
When a user adds a new attachment, a new entity is created through the manager, and changes are immediately saved to the server after the file upload. However, before the project detail view renders, a new message entity is also created, leading to a validation error when saving the attachment entity. How should I manage the state of these two entities? Below is an excerpt from my code:
Model Classes
Project.cs
Public class Project
{
public int Id { get; set; }
[Required, MaxLength(50)]
public string Title { get; set; }
[Required, StringLength(2000, ErrorMessage = "Enter {0} between {1} to {2} characters long", MinimumLength = 300)]
public string Description { get; set; }
[Required, Range(10, 10000)]
public int Budget { get; set; }
[Required]
public DateTime Created { get; set; }
public ICollection<Attachment> Attachment { get; set; }
public ICollection<Messages> Messages { get; set; }
}
Messages.cs
public class Messages
{
public int Id { get; set; }
public int ProjectId { get; set; }
[Required]
public string Text { get; set; }
public Project Project { get; set; }
}
Attachment.cs
public class Attachment
{
public int Id { get; set; }
public int ProjectId { get; set; }
public string Name { get; set; }
public string Path { get; set; }
public Project Project { get; set; }
}
Controller.js
function activate() {
getNewMessage();
common.activateController([getProject()], controllerId)
.then(function () {
});
}
function addNewAttachment(file) {
var attachment = datacontext.createNewAttachment();
//other stuff
return datacontext.save()
.then(function () {
});
}
function getNewMessage() {
vm.message = datacontext.createNewMessage();
}
datacontext.js
function createNewMessage() {
return manager.createEntity('Messages');
}
function createNewAttachment() {
return manager.createEntity('Attachment');
}