2.3.2
Attach an HTTP Request to an Existing Long-Running Transaction
When you are building a multi-page application, it might be useful to create an object in a transaction without committing it.
If you want to provide the user with a URL to an uncommitted object, you will need to attach the view-model of the request handler to the existing long-running transaction.
The following button handler creates a
Person object and redirects to its page, without committing the object:1
public void Handle(Input.CreatePerson action)
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{
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var person = new Person()
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{
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FirstName = "Uncommitted Guy"
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};
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​
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RedirectUrl = "/people/persons/" + person.GetObjectID();
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}
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When the request handler for
"/people/persons/{?}" catches the request after the redirection, it needs to search for the object by its ID in the existing long-running transaction:1
Handle.GET("/people/persons/{?}", (string id) =>
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{
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MasterPage master = GetMasterPageFromSession();
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​
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Action runPartialInScope = () =>
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{
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master.CurrentPage = Self.GET("/people/partials/persons/" + id);
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};
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​
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if (master.CurrentPage.Transaction != null)
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{
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// Attach to a long running transaction of the existing CurrentPage
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master.CurrentPage.Transaction.Scope(runPartialInScope);
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}
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else
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{
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// If there was no existing CurrentPage, create a new transaction
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Db.Scope(runPartialInScope);
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}
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​
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return master;
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});
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