Model Driven Apps - Create many to many relationships with additional columns

Something I found relatively difficult to find online is what to do when I have two tables and I want to create a many to many relationship but additionally hold extra columns about that relationship.

When dealing with regular databases you would create a join table (intermediate table) which would hold a one to many relationship between tables:

Creating a many to many relationship is pretty straight forward in Dataverse and there is an out of the box relationship builder to do that, however any joiner table is hidden and you can't customise this.

This guide explains a really simple way to hook the joiner table up, as when I tried to make the one to many relationships manually and add data using a model driven app, the relationship wasn't being recognised.

Some Background

My example takes a very simple "Building Project" log book which is to hold information about building jobs and the contractors associated to that job. The contractors will be coming from the default "Contacts" list provided in Dataverse out of the box. However I also want to store what the "Job Responsibilities" will be for that contractor on a specific job, and the rate they will charge for that contract (as in this example their rate could change depending on the responsibility).

The first thing to do is create a new solution to hold the components in and then the main tables you need, I create a  "Build Projects" table and add the columns such as the Project description and Budget. You can see my tables listed below:

I then create the intermediate table, originally I called this "Project and Contractors Joiner" and then renamed it to "Contractor" as it made more sense when adding new data, as this is holding the information on Contractors. Remember to change the Primary column to something interesting. In my example I use the primary column to hold the Job Role about the contractor:

Once you have done this open the newly created Contractor table and add the additional columns to store the information about the contractor such as "Job Rate".

You can then create the one to many relationship, and to do this all you need to to create two lookup columns! Dataverse sorts all the rest out. The first column "Contact" is a lookup to the Contact table (I set both columns required - in hindsight you can call this column "Contractor" as that's what we're referring to in this example):

The second lookup column "Build Project" is a lookup to the "Build Project" table:

I then edit the "Main" information form for the new Contractor table and add in the lookup Columns and the Job Rate (remember to save and publish!):

I want the user to be able to add the contractors when they are entering information about a new job, to do this I open the Main information form for the Build Projects table. I add the additional Build Project columns (Description, Budget) and add a new 1-column section below the general information.

In this new section I then add a "Subgrid" from the "Grid" component menu. You can then click the "Show related records" and the "Contractors" table will be displayed in the list:

 

I use the "Active" default view, once that's added in the Display Options, make sure that "display related records" is checked. In the Display options you'll see the "Edit view" button. You can select this to then add the columns you want displayed in the subgrid. I just include the "Contact" and the "Job Role" here:

You are now ready to create the Model Driven Power App, if you are using a solution (which you should!) open the solution in make.powerapps.com and then select the New menu and choose App > Model-drive app.

I title my app "Build Projects Contractor Log". Add a new page - a table based view form and search for "Build Projects" in the list. Add another page (table based view form) and this time search for the Contact list, as this is where I'm holding my active contractors.  This then allows the users to add new build projects and contractors. 

Rename the "Contacts" Page to "Contractors":

You can then run the application and try it out! Create a new build project and enter some details, you'll see the contractor section is blank whilst you fill out this info:

When you save the new build project you can then add a new "Contractor":

You'll then see when you add a new contractor the Build Project is conveniently hooked up! Thanks Power Apps for making that all just work:

Anyway I hope you found this useful if you are new to model-driven apps.

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