v0.20.1: Fix Decimal serialization in form_data JSONField

- Add DjangoJSONEncoder to FormSubmission.form_data so Decimal values
  (e.g. currency fields) serialize correctly on save
- Fixes 500 error on approve_submission when form_data contains Decimals

Author: matteius

django_forms_workflows/migrations/0043_fix_form_data_decimal_encoding.py

@@ -0,0 +1,22 @@
+# Generated by Django 5.2.7 on 2026-03-12 20:30
+
+import django.core.serializers.json
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("django_forms_workflows", "0042_add_sub_workflow_section_label"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="formsubmission",
+            name="form_data",
+            field=models.JSONField(
+                encoder=django.core.serializers.json.DjangoJSONEncoder,
+                help_text="The actual form responses",
+            ),
+        ),
+    ]

django_forms_workflows/models.py

@@ -6,6 +6,7 @@
 
 from django.conf import settings
 from django.contrib.auth.models import Group
+from django.core.serializers.json import DjangoJSONEncoder
 from django.db import models
 
 
@@ -1149,7 +1150,10 @@ class FormSubmission(models.Model):
     )
 
     # Submission Data
-    form_data = models.JSONField(help_text="The actual form responses")
+    form_data = models.JSONField(
+        help_text="The actual form responses",
+        encoder=DjangoJSONEncoder,
+    )
     attachments = models.JSONField(
         default=list, blank=True, help_text="List of uploaded file paths"
     )

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "django-forms-workflows"
-version = "0.20.0"
+version = "0.20.1"
 description = "Enterprise-grade, database-driven form builder with approval workflows and external data integration"
 license = "LGPL-3.0-only"
 readme = "README.md"