5.1+ Fix (length_is deprecated and removed in Django 5.1) (#36)

* 5.1+ Fix (length_is deprecated and removed in Django 5.1)

* bumps version

Author: fpintoppb

theme/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "0.0.14"
+__version__ = "0.0.15"
 
 # set default_app_config when using django earlier than 3.2
 try:

theme/templates/admin/includes/fieldset.html

@@ -2,11 +2,11 @@
 
 <fieldset>
     {% for line in fieldset %}
-        <div class="form-row{% if line.fields|length_is:'1' and line.errors %} errors{% endif %}{% if not line.has_visible_field %} hidden{% endif %}{% for field in line %}{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% endfor %}">
-            {% if line.fields|length_is:'1' %}{{ line.errors }}{% endif %}
+        <div class="form-row{% if line.fields|length == '1' and line.errors %} errors{% endif %}{% if not line.has_visible_field %} hidden{% endif %}{% for field in line %}{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% endfor %}">
+            {% if line.fields|length == '1' %}{{ line.errors }}{% endif %}
             {% for field in line %}
-                <div class="w-100{% if not line.fields|length_is:'1' %} fieldBox{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% if not field.is_readonly and field.errors %} errors{% endif %}{% if field.field.is_hidden %} hidden{% endif %}{% elif field.is_checkbox %} checkbox-row{% endif %}">
-                    {% if not line.fields|length_is:'1' and not field.is_readonly %}{{ field.errors }}{% endif %}
+                <div class="w-100{% if not line.fields|length == '1' %} fieldBox{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% if not field.is_readonly and field.errors %} errors{% endif %}{% if field.field.is_hidden %} hidden{% endif %}{% elif field.is_checkbox %} checkbox-row{% endif %}">
+                    {% if not line.fields|length == '1' and not field.is_readonly %}{{ field.errors }}{% endif %}
                     {% if field.is_checkbox %}
                         <div class="form-group form-inline">
                             <label for="field-{{ field.field.name }}" class="col-md-2 col-form-label justify-content-start">{{ field.label_tag }}</label>