From Structure to Connections: Setting Up Effective Relationships in Adalo

Resources & Tutorials
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Hey everyone, building on my last guide about structuring collections (find it here), let’s talk relationships. In the client apps I’ve built, getting these right early saves tons of fixes later, slow lists, broken filters, inconsistent data all stem from rushed relationships.

Relationships connect collections cleanly, avoiding duplicates. Here’s the practical breakdown.

Choosing the right type
I map it to “real world” logic:

  • One-to-Many: Most common. One User owns many Listings; many Listings point to one User. I use this even for “one-to-one” needs by limiting to a single link.

  • Many-to-Many: For flexible links, like Users favoriting multiple Products. Set up an intermediary collection (e.g., Favorites) with two One-to-Many relationships.

Only add a relationship if you’ll frequently pull data across collections.

Setup steps

  1. In the database, add a Relationship property.

  2. Select the target collection and type. Adalo creates the reverse link automatically.

  3. For Many-to-Many, build the intermediary first.

  4. Test immediately with magic text on a screen.

Common issues I’ve fixed for clients

  • Wrong direction → filters fail. Check the arrow.

  • Deep chains → slowdowns. Denormalize key fields when needed.

  • Deletes leaving orphans → add specific actions to clean up.

  • Big datasets → use counted properties for quick stats.

Marketplace example (continued)

  • Listings: One-to-Many from Users (seller)

  • Orders: One-to-Many from Users (buyer); links to one Listing

  • Reviews: One-to-Many from Listings and Users

  • Favorites/Messages: Many-to-Many via intermediaries

This powers smooth dashboards, histories, and real time updates.

Quick checklist

  • Type matches real data flow?

  • Magic text access is simple?

  • Updates/deletes stay consistent?

  • Optimized for scale?

Solid relationships make apps feel pro. If yours are tricky or you’re planning a bigger build, share details here or DM me, I’ve sorted these for many projects.

(Part 2 of my practical database series, more coming)

Ali Bazzi
Adalo Community Leader & Expert

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Quick update: Expanded the many-to-many section with examples and added performance tips for large relations.

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Awesome - Love the brevity of it all.

Some jargon (to me) - Can you elaborate?

I can guess what “deep chains” is/are… not sure.

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Hey @C3PO,

Thanks for the kind words, I’m glad it’s helpful!
Regarding the points you’ve mentioned, here’s a quick breakdown:

  • “Wrong direction”: When adding a new relationship, you’ll see 3 main relationship types (one-to-many, many-to-one, many-to-many). Those types specify the direction of your relationship between these 2 collections.

  • “Deep chains”: Deep chains => slowdowns. Denormalize key fields when needed.
    Deep chains are very long relationship paths (User => Listings => Orders => Reviews).
    So the app has to keep jumping between collections to get data, which slows lists, filters, and screens with big data.
    Denormalize means copy important properties directly (For example, copy the (Username) into the “Listings” collection instead of always pulling it from the “Users” collection).
    This makes everything much faster.

    Let me know if you need further information.

    Ali Bazzi
    webnux.org | consultation.webnux.org

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wrong direction: what I thought. thanks.

Denormalize is where I was lost. Now found. I always wondered about concept.

Thanks, again.

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regarding the concept of having an intermediary screen, for favorites…

do you have a link to the Adalo docs for this? OR….

If I remember correctly, this MAY mean a work-around; such as turning a button into a list, pop-in a blank screen, with an update action, or something..

Am I on the right track, here. I think I need to re-read your post.

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Aloha all - I’m new to this community.

Ali’s post on structure is spot on. To build on that, I wanted to share a super simple way to implement Join Tables (Intermediary Collections) instead of relying on native Many-to-Many relationships (I almost always migrate any Many-to-Many relationships to Join Tables).

In my experience, this is the best way to keep your data clean and scalable.

The Concept

Instead of linking Collection A directly to Collection B, you create a third collection: The Join Table.

  • Collection A: Students

  • Collection B: Classes

  • Join Table: Enrollments (Links to 1 Student and 1 Class)

How to Set It Up (The 2-Minute Version)

  1. Create the Collection: Add a new collection (e.g., Enrollments).

  2. Add Relationships: Add two relationship properties:

    • One to Students (A student can have multiple enrollments).

    • One to Classes (A class can have multiple enrollments).

  3. The Action: On your “Join” or “Sign Up” button, simply add a second action:

    • Action 1: (Whatever your primary logic is).

    • Action 2: Create > Enrollment and link it to the Current Student and Current Class.

Why this works great:

  • It’s simple: You just add one extra record creation to your workflow.

  • Metadata: You can now add properties to the Enrollment record like “Status” (Pending/Active) or “Sign-up Date.”

  • Easy Cleanup: If things ever get out of sync, I use n8n or Make to run a quick cleanup script. It’s much easier to manage individual join records than to untangle a native Adalo many-to-many list.

I’ve found this approach keeps my apps much more stable as they grow. Has anyone else made the switch from native N:M to Join Tables?

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Nice. I’ve tried with a little success in the past.

I think that I was missing the concept of “Action 2” — sounds like a useful approach. Thanks.

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Hey @C3PO & @michaelappdev,

Thanks for the great questions and additions!

@C3PO: For the intermediary collection in many-to-many (For example: Users favoriting Products), there’s no direct doc page just for this, but it’s covered in the Relationships section here: https://help.adalo.com/database/relationships

The “workaround” is like what michaelappdev described, create the intermediary collection yourself (Favorites) with two one-to-many relationships. No need for blank screens, just Create a new Favorite record linking the User and Product on the action.

@michaelappdev: You’re right with the Join Table approach, it’s clean and more scalable than normal many-to-many for some apps. I do the same migration in bigger projects.

If anyone wants a cloneable example of a clean Join Table setup (e.g., Favorites with status), let me know.

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Conceptually, I’m picking up, what you’re putting down. Thank you.

My app is small; little need, I think, but there’s one relationship that may work well.

I’m sure it will become even more clear, once I get into it.

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Hey @C3PO,

Thank you, I’m glad it’s starting to make sense.

For that one relationship you’re considering, feel free to share the two collections involved (For example: “Users” and "Products”…). I’d be happy to guide you through the exact setup step-by-step or provide a cloneable you can copy and adapt directly.

These concepts usually become much clearer once you’re working in the app screens. I’m available whenever you’re ready.

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Thank you, kindly. Making some flow-charts, now. Compare options. Plus, I’m looking at tweaking the on-boarding.