Osama's Weblog

I was studying the latest pages developers guide and found some components that have been added to salesforce.com.

These are

• Apex Panel Bar
• Apex Panel Grid
• Apex Tab Panel

These controls can further enrich the user experience and the developer can now avoid to use external library components such as jQuery etc in visualforce.

I have created a simple demo which can show these working. Its almost same as in the guide.

I was wondering what if I have to create a one to one relationship between two objects. There is no declarative way where we can specify a one to one relationship between two objects.

We can write a trigger to enforce a one to one relationship between two objects. The trigger can be written on the child object that validates if there is any other record with same Parent record ID. If found then instead of inserting the record, it gives an alert.

The trigger will generate a list of child objects with specified parent ID. If the list’s length that is retrieved is greater than one, it will generate an alert.

List<ChildObject> co = [select name from ChildObject where parentId = ParentId]
If  (co.Size() < 2)
{
//insert
}
else
//generate alert