Relations

Do you have data where multiple records relate to a single feature? In this video, we explore how to set up text relations in QGIS and Mergin Maps to handle these "one-to-many" scenarios efficiently! Whether you are documenting multiple inspections for one asset or mapping various amenities within a single park, this workflow is essential. We will walk you through setting up a parent layer (Parks) and a child layer (Amenities) using UUIDs to ensure your data stays distinct and error-free during synchronization. In this tutorial, you’ll learn: ✅ How to identify and structure 1-to-many relations (e.g., one park, many benches). ✅ Why using UUIDs (Unique IDs) is critical for avoiding sync conflicts when multiple surveyors are working at the same time. ✅ How to configure Project Properties to link parent and child layers correctly. ✅ How to edit and add related "child" features directly from the parent form in the Mergin Maps mobile app. Timestamps: 0:00 - Introduction to 1-to-Many Relations 0:41 - The Example: Parks & Amenities 1:15 - Why you need UUIDs for syncing 2:00 - Setting up the Parent Layer 3:17 - Setting up the Child Layer 3:50 - Configuring Relations in QGIS 6:13 - Collecting Data in Mergin Maps Mobile App