Conflicts can occur in PouchDB when multiple clients make conflicting changes to the same document while offline, and those changes are later synchronized with a remote database. PouchDB provides built-in conflict resolution mechanisms to handle conflicts and ensure data integrity. Here's how you can handle conflicts in PouchDB:
Detecting Conflicts :
* PouchDB detects conflicts when it encounters conflicting revisions of the same document during replication with a remote database. Conflicting revisions occur when different clients make changes to the same document independently.
Conflict Resolution Strategies :* PouchDB provides several conflict resolution strategies to handle conflicts :
* Last-Write-Wins (LWW) : By default, PouchDB uses the Last-Write-Wins strategy, where the most recent revision takes precedence over conflicting revisions. In other words, the last change made to the document wins, and conflicting changes are discarded.
* Custom Conflict Resolution : Developers can implement custom conflict resolution logic to handle conflicts based on application-specific criteria. Custom conflict resolution allows developers to define rules for merging conflicting changes or prompting users to resolve conflicts manually.
Automated Conflict Resolution :
* PouchDB's conflict resolution mechanisms can be automated to resolve conflicts automatically without user intervention. For example, you can configure PouchDB to use the Last-Write-Wins strategy or implement custom conflict resolution logic to resolve conflicts based on predefined rules.
Manual Conflict Resolution :
* In some cases, conflicts may require manual intervention to resolve. For example, if conflicting changes cannot be automatically resolved or if the application requires user input to resolve conflicts, you can implement a user interface for resolving conflicts manually.
Conflict Event Handling :
* PouchDB provides events and callbacks for handling conflict events during replication. You can listen for conflict events and implement custom logic to handle conflicts as they occur.
* For example, you can use the conflict event to detect conflicts during replication and trigger conflict resolution logic or notify users of conflicts that require manual intervention.
Conflict Metadata :
* PouchDB provides metadata for conflicted documents, allowing you to inspect the conflicting revisions and determine how conflicts should be resolved.
* You can access conflict metadata, such as revision IDs and conflicting revisions, to implement custom conflict resolution logic or display conflict information to users.
