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gpnf-limit-entry-min-max-from-field.php: Fixed an issue with entry min max recalculation logic not working. #1072

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2900858881/81887

Summary

The snippet to set the min/max of nested form entries is generating errors in the browser console and affecting the Nested Forms field.

https://www.loom.com/share/4f8c17e6082a4b1f9f29ce1f61d296f0?sid=cb9a84fa-2b25-4c62-b6b9-3d76a9377702

This PR updates the logic for triggering Knockout reactivity when the max value field is changed in a GPNestedForms context.

Currently, we have .valueHasMutated() on the entries observable to force recalculation when max field value is changed. However, in some scenarios, entries is a computed observable (not writable) and does not support .valueHasMutated(), leading to a console error. This update adds a fallback by reassigning a shallow clone of entriesRaw() to itself.

@saifsultanc saifsultanc changed the title gpnf-limit-entry-min-max-from-field.php]: Fixed an issue with entry min max recalculation logic not working. gpnf-limit-entry-min-max-from-field.php: Fixed an issue with entry min max recalculation logic not working. Apr 10, 2025
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coderabbitai bot commented Apr 10, 2025

Walkthrough

This change improves the output_script method in the gp-nested-forms/gpnf-limit-entry-min-max-from-field.php file. The code now first checks for the presence of Knockout’s valueHasMutated method on the observable, and if absent, it falls back to using an alternative mechanism (a shallow copy via entriesRaw) to trigger reactivity. Additionally, a redundant comment was removed and replaced with a clarifying comment.

Changes

File(s) Change Summary
gp-nested-forms/gpnf-limit-entry-min-max-from-field.php Enhanced the output_script method to check for valueHasMutated; uses a fallback (entriesRaw) when not supported. Redundant comment removed and replaced.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant OutputScript
    participant Observable

    Caller->>OutputScript: Call output_script()
    OutputScript->>Observable: Check for valueHasMutated method
    alt valueHasMutated exists
        OutputScript->>Observable: Call valueHasMutated() to trigger reactivity
    else No valueHasMutated
        OutputScript->>Observable: Use entriesRaw to create shallow copy and trigger reactivity
    end
    Observable-->>OutputScript: Observable updated
    OutputScript-->>Caller: Return updated observable state
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  • veryspry

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Reviewing files that changed from the base of the PR and between 3053ec0 and bfdb207.

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  • gp-nested-forms/gpnf-limit-entry-min-max-from-field.php (1 hunks)
🔇 Additional comments (2)
gp-nested-forms/gpnf-limit-entry-min-max-from-field.php (2)

157-159: Good improvement to error handling and code clarity

The updated comment more clearly describes the purpose of this code block, and using optional chaining (?.) when accessing the viewModel is a good defensive programming practice to prevent errors when the viewModel might not be available.


161-168: Well-implemented fallback mechanism for Knockout observables

This change directly addresses the issue with console errors by:

  1. First checking if the standard valueHasMutated() method exists before calling it
  2. Providing a fallback for computed observables using entriesRaw()
  3. Using defensive programming with optional chaining to prevent errors

The implementation smartly handles both types of Knockout observables while maintaining the intended functionality of triggering reactivity when the max field value changes.

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