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Typically, the parent parameter will be strongly typed, based on the class of the parent object itself.
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As an example, the ProjectResource child object will need the Id property from its parent Project object so that it can store it as a foreign key in the database. By getting a reference to its parent Project object, the ProjectResource gains access to that value as needed. The Fetch(), Insert(), and Update() methods all call MarkOld() when they are done, because the object s data in memory matches that in the database at those points, so the object is neither new nor dirty. The DeleteSelf() method calls MarkNew() as it completes, because the object s primary key value is not in the database at that point, so the object qualifies as a new object.
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As implemented, the template uses DataPortal.Create() to load the child object with default values from the database. As discussed earlier, if the object doesn t need to load default values from the database, the code can be implemented more efficiently by changing the Shared factory method to create the child object directly:
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CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
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Friend Shared Function NewEditableChild() As EditableChild Return New EditableChild End Function Then the DataPortal_Create() method can be removed, since it won t be used. The default constructor is then used to set any default values that are hard-coded into the class.
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It s possible that some classes must be instantiated as root objects on some occasions and as child objects on others. This can be handled by conditionally calling MarkAsChild(), based on how the object is being created.
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In most cases, the need for a switchable object indicates a flawed object model. While there are exceptions for which this makes sense, you should carefully examine your object model to see if there s a simpler solution before implementing a switchable object.
Conditionally calling MarkAsChild() typically can t be done in the default constructor, because there s no way to determine whether the object is being created as a root or a child object at that point. Instead, you need to go back to your object s life cycle to see where you can make this decision. In fact, since the default is for an object to be a root object, all you need to do is determine the paths by which a child object can be created, and make sure to call MarkAsChild() only in those cases. The template for creating a switchable object is the same as the editable root template, with the following exceptions: Dual criteria objects Dual create and fetch factory methods Dual create and fetch data access methods Let s discuss each change in turn.
Dual Criteria Classes
The object s criteria must now include a flag to indicate whether the object is being created as a root or a child object (this is in addition to any object-specific criteria fields in this class). This can be done either by adding an actual flag field to the Criteria class or by creating a second criteria class. I prefer the second approach as it makes the code simpler overall. Remember that for a child object, the criteria class is only used for the create operation, and so it typically doesn t need any actual criteria data. The result is that there are two criteria classes; for example: <Serializable()> _ Private Class RootCriteria Private mId As Integer Public ReadOnly Property Id() As Integer Get Return mId End Get End Property
CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
Public Sub New(ByVal id As Integer) mId = id End Sub Public Sub New() End Sub End Class <Serializable()> _ Private Class ChildCriteria End Class These two classes will be used to differentiate the way the object should be created.
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