Detail-with-two-masters : Is there a demo ?

Question

Hi all,
I found in the manual following description and I think
this could be a solution for many-to-many related Forms blocks (intersection table=detail) :
A detail-with-two-masters relation involves a single detail block that has two master blocks.
Form Builder displays the appropriate detail records for whichever master block is the current block in the form.
For example, in the sample application referred to earlier, the ord block could be a detail block having two master blocks, CUSTOMER and EMP.
End users could then see all of the orders for a particular customer, or for a particular sales representative (employee).
Usually, when you create a detail-with-two-masters relation, you will be joining on different foreign-key items in the detail block.
In such cases, the Copy Value from Item property is set for each foreign-key item in the detail block to point
to the primary-key item in the appropriate master block.
To create this type of relation, you need only define the two relations; Form Builder will automatically support coordination.
In other cases, however, you might want to create a master-with-two-details with each relation joining
on the same foreign-key item in the detail block.
However, because the Copy Value from Item property can only point to one master block item,
you will need to write additional code to coordinate querying and
updating for the second relation if you are joining on the same item in the detail block.
Depending on the desired functionality, this might include writing a Pre-Query trigger
for the detail block to ensure that the correct primary-key item value
is copied to the foreign-key item in the detail block. For example,
COPY(NAME_IN(:system.master_block||'.primary_key_item'), 'detail_block.item');
You might also want to create a When-New-Block-Instance trigger that checks
the coordination status of the detail block whenever
the end user navigates to a different master block, and,
if necessary, populates the detail block.
OK. But sorry, I can not realize it.
Has anyone a FMB-demo or a to-do list to declare this manual description (many-to-many problem) ???
Many Thanks in advance
Friedhold
[email protected]

Answer 1

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