Adds ERXPartial.init(). #602

Here we add an init() method which subclasses (that is, partial
entities) can override. We also implement init() in
ERXPartialGenericRecord, and have it call init() on all the partial
entities it knows about. This works exactly the same way as
awakeFromInsertion(), for example.

Frameworks/Core/ERExtensions/Sources/er/extensions/partials/ERXPartial.java

@@ -368,4 +368,15 @@ public Object validateValueForKey(Object value, String key) throws NSValidation.
 			throw exception.exceptionWithObjectAndKey(this, key);
 		}
 	}
+
+	/**
+	 * Delegated from the base entity. A partial entity can override this method
+	 * to perform object initialisation. It will be called when the base
+	 * entity's {@code init()} method is called.
+	 * 
+	 * @param editingContext
+	 *            this object's {@link EOEditingContext}
+	 */
+	protected void init(EOEditingContext editingContext) {
+	}
 }

Frameworks/Core/ERExtensions/Sources/er/extensions/partials/ERXPartialGenericRecord.java

@@ -180,6 +180,15 @@ public void awakeFromInsertion(EOEditingContext editingContext) {
 		}
 	}
 
+	@Override
+	protected void init(EOEditingContext editingContext) {
+		super.init(editingContext);
+		// Call init() on all partial entities
+		for (ERXPartial partial : _partials()) {
+			partial.init(editingContext);
+		}
+	}
+
 	@Override
 	public void awakeFromFetch(EOEditingContext editingContext) {
 		super.awakeFromFetch(editingContext);