Reviewer's Guide

Enhance migration 0033 by tightening the conditional in the forwards function to update placeholder associations only when an existing placeholder object is present, preventing failures on missing records.

Class diagram for updated placeholder association logic in migration 0033

classDiagram
    class PlaceholderField {
        +content_type_id
        +object_id
        +save()
    }
    class ContentType {
        +pk
    }
    class Object {
        +pk
    }
    PlaceholderField -- ContentType : content_type_id
    PlaceholderField -- Object : object_id

Flow diagram for conditional update in migration 0033

flowchart TD
    A["Iterate over objects"] --> B["Check if placeholder object exists"]
    B -- Yes --> C["Create new PlaceholderField with content_type_id and object_id"]
    B -- No but obj_placeholder_field exists --> D["Update obj_placeholder_field with content_type_id and object_id"]
    D --> E["Save obj_placeholder_field"]

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