How to display N:N relation (with a view)

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Hello everyone.

I have a relation N:N between a custom entity (training day) and some contacts.
Each contact can be linked to N training days.

With the custom report wizard, I can display for each training day the trainees list. (with the Regarding option, i can see "Trainees" (contacts)).

But it is possible to display via a view this N:N relation ? It's easy to understand that behind that, i've probably an SQL table for the relation (id contact / id training day) but how can I see that with a view (entity) :

Training day 1 - Contact 1
Training day 1 - Contact 2
Training day 2 - Contact 1 ...

Thanks for your help. I hope "report" is not the only way.

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Wayne Walton 13,730 on at

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There is no out of the box method of showing N:N relationships in a view. You need a report.

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Community Member on at

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You would be better off to change your design. Instead of using a native N:N relationship that uses a hidden intersect entity that you cannot get at, view or report on, create your own entity with a lookup to Training Day and to Contact.

You can then do whatever you like with this entity, and in particular you could add more fields to hold useful information, such as the status reason of their booking (for example: tentative, confirmed, paid, attended, cancelled, no-show...), when they made the booking, special [dietary|other] requirements, feedback scores...

Total time to build entity, custom status reasons, form and a couple of views: under 30 minutes

Of course, if you already have lots of data using the N:N then moving this across may be easier said then done, but in the long term could be worth the effort.

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Community Member on at

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Hi Adam and thank you for your very interesting answer.

Thank you Wayne too.

I've many data to migrate but I will study this possibility.

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Hello,

I did this way. It solve my problem:

Suppose we have a N:N relationship between Opportunity and SystemUser

Now we want to view all related users on opportunity view

1. Create a field in Opportunity entity named new_usernamecombine. That holds all the combination of username

2. When we create a N:N relationship, there's another table created in DB: new_opportunitysystemuser

3. Create 2 triggers on this table to track the Insert and Delete event. In these triggers, update field new_usernamecombine

create trigger UpdateSystemUserCombine_delete

on new_opportunity_new_partnerBase

after delete

as

begin

update OpportunityBase set new_usernamecombine = (

select pb.FirstName + ', ' from

new_opportunity_systemuser opb

join systemuserBase pb on pb.SystemUserId = opb.SystemUSerId

where

opb.OpportunityID = (select OpportunityId from deleted)

FOR XML PATH(''))

where

OpportunityID = (select OpportunityId from deleted)

end

Hope it helps,

Hien

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