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Understanding Conflicts in Data Synchronization

Conflicts occur when any of these conditions is met:

1) distinct users set the same attribute on the same feature to different values; 2) a primary key is employed twice. While highly unlikely have conflicts, preventing, mitigating and resolving conflicts is important to maintain data integrity in a healthy QGIS project. Here are some tips and tricks to do just that.

How to Avoid Conflicts?

  1. Unique "fid" Serial Numbers:
  2. When creating a feature, it is recommended to assign a unique "fid" serial number to each feature in the layers.
  3. Use the expression "epoch(now())" (without the double quote) in the "fid" to generate a unique identifier per millisecond, reducing the possibility of duplicate "fid" numbers.

  4. Planeamento e Designação:

  5. For updating existing features based on field conditions, plan and designate the features each user will update.
  6. Users should avoid changing the "fid" or identifier numbers.

Como Resolver Conflitos?

  • By default, QFieldCloud overwrites conflicts using a last wins policy (the latest patch of changes to the attribute(s) involved in the conflict replaces all earlier patches of changes to these attributes). Alternatively, admins can set a project's conflict resolution policy to manual. Doing so will require the project manager to manually resolve conflicts, picking those to be applied to the project.

  • Quando lidar com conflitos:

  • Navegue até a seção "Alterações".
  • Filter the changes with the "Not_applied" status.
  • For each conflicted change, select it and set the status to "Re-apply" from the "Action" dropdown menu, alternatively if all the new changes are in conflict you can choose in the last conflicted change and select "Re-apply this and newer changes".
  • Check the details of changes in the conflict and click "Save All" at the end of the page.
  • Refer to our official documentation Delta apply for additional information.