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automatically create ActiveRecord parent for association

You can use first_or_create:

@wallet_transaction =

UPDATE: I misunderstood the question, you should create the wallet first if none exists and then refer to the transactions through the @wallet instance. Doing so also ensures that the wallet_id of WalletTransaction is always referred to the correct wallet.

@wallet = @user.wallet.first_or_create
@wallet_transaction =

Categories : Ruby On Rails

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ActiveRecord has_many association null
I think the problem is that you used session_player, but it should be session_players, use this line instead <% session.session_players.each do |player| %> And in your model, since you are using has_many, you should use pluralized form of model name has_many :session_players

Categories : Ruby On Rails
What is the best way to create a parent/master entry in a DJANGO CRUD database app and then add associating data fields to the parent/master?
No. You don't need multiple barcode models. The fact that you have a ForeignKey from barcode to hardware already allows you to have multiple barcodes for each hardware: a ForeignKey defines a many-to-one relationship. Also, it doesn't make any sense to name the foreignkey after the model it is in: it needs to be named for the model it is pointing to, ie hardware. Finally, don't prefix your field n

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Automatically create Timer in Netbeans
TimerSessionBean is a singleton session bean that shows how to set both an automatic timer and a programmatic timer. In the source code listing of TimerSessionBean that follows, the setTimer and @Timeout methods are used to set a programmatic timer. A TimerService instance is injected by the container when the bean is created. Because it’s a business method, setTimer is exposed to the local, no-

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How to create subclass such that it's attribute values are not overridden from parent class?
class Duck { protected String color; protected int numLeg; protected boolean haveWings; public Duck() { color = ""; numLeg = 2; haveWings = true; } public void swim() { //Do something } } class RubberDuck extends Duck { public RubberDuck() { color = "yellow"; numLeg = 0; haveWings = true; } public void swim() { //Do something } }

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How to create multi module project in maven ? so that all the code base of child projects can be in parent one
Just create your pom.xmls the usual way. On the inner ones you can add <parent> <groupId>(YOUR GROUP ID)</groupId> <artifactId>(YOUR ARTIFACT ID)</artifactId> <version>(YOUR VERSION)</version> <relativePath>../</relativePath> </parent> To make them include the outer one.

Categories : Maven
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automatically create ActiveRecord parent for association
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