nested form for adding title children

mycollections/admin.py

@@ -3,4 +3,5 @@
 # Register your models here.
 
 admin.site.register(Collection)
-admin.site.register(CollectionTitle)
+admin.site.register(CollectionTitle)
+admin.site.register(CollectionTitleChild)

mycollections/forms.py

@@ -4,6 +4,41 @@
 from crispy_forms.helper import FormHelper
 from crispy_forms.layout import Layout, Field, Fieldset, Div, HTML, ButtonHolder, Submit
 from .custom_layout_object import *
+from django.forms.models import BaseInlineFormSet
+
+
+CollectionTitleChildFormSet = inlineformset_factory(
+    CollectionTitle, CollectionTitleChild,
+    fields=['name', 'language'], extra=2, can_delete=True
+    )
+
+
+class BaseTitleChildFormset(BaseInlineFormSet):
+
+    def add_fields(self, form, index):
+        super(BaseTitleChildFormset, self).add_fields(form, index)
+
+        # save the formset in the 'nested' property
+        form.nested = CollectionTitleChildFormSet(
+            instance=form.instance,
+            data=form.data if form.is_bound else None,
+            prefix='child-%s-%s' % (form.prefix, CollectionTitleChildFormSet.get_default_prefix()))
+
+    def is_valid(self):
+        result = super(BaseTitleChildFormset, self).is_valid()
+        if self.is_bound:
+            for form in self.forms:
+                if hasattr(form, 'nested'):
+                    result = result and form.nested.is_valid()
+        return result
+
+    def save(self, commit=True):
+        result = super(BaseTitleChildFormset, self).save(commit=commit)
+        for form in self.forms:
+            if hasattr(form, 'nested'):
+                if not self._should_delete_form(form):
+                    form.nested.save(commit=commit)
+        return result
 
 
 class CollectionTitleForm(forms.ModelForm):
@@ -12,10 +47,16 @@ class Meta:
         model = CollectionTitle
         exclude = ()
 
+# CollectionTitleFormSet = inlineformset_factory(
+#     Collection, CollectionTitle, form=CollectionTitleForm,
+#     fields=['name', 'language'], extra=1, can_delete=True
+#     )
+
 CollectionTitleFormSet = inlineformset_factory(
     Collection, CollectionTitle, form=CollectionTitleForm,
-    fields=['name', 'language'], extra=1, can_delete=True
-    )
+    formset=BaseTitleChildFormset,
+    fields=['name', 'language'], extra=1, can_delete=True)
+
 
 
 class CollectionForm(forms.ModelForm):

mycollections/migrations/0003_collectiontitlechild.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.1.7 on 2019-03-20 19:34
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mycollections', '0002_auto_20190213_1141'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CollectionTitleChild',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=500, verbose_name='Child')),
+                ('language', models.CharField(max_length=3)),
+                ('collection_title', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='has_children', to='mycollections.CollectionTitle')),
+            ],
+        ),
+    ]

mycollections/models.py

@@ -23,3 +23,15 @@ class CollectionTitle(models.Model):
         related_name="has_titles", on_delete=models.CASCADE)
     name = models.CharField(max_length=500, verbose_name="Title")
     language = models.CharField(max_length=3)
+
+
+class CollectionTitleChild(models.Model):
+    """
+    A Class for Collection title children.
+
+    """
+    collection_title = models.ForeignKey(CollectionTitle,
+        related_name="has_children", on_delete=models.CASCADE)
+    name = models.CharField(max_length=500, verbose_name="Child")
+    language = models.CharField(max_length=3)
+

mycollections/templates/mycollections/collection_detail.html

@@ -13,6 +13,14 @@ <h1><b>Collection ID {{ object }}</b></h1>
             <th>Title @{{title.language}}</th>
             <td>{{title.name}}</td>
         </tr>
+        {% if title.has_children.all %}
+        {% for child in title.has_children.all %}
+        <tr>
+            <th>Child @{{child.language}}</th>
+            <td>{{child.name}}</td>
+        </tr>
+        {% endfor %}
+        {% endif %}
         {% endfor %}
         {% endif %}
         <!--end-->

mycollections/templates/mycollections/formset.html

@@ -17,7 +17,35 @@
                     {{ field|as_crispy_field }}
                 </td>
                 {% endfor %}
+
+            </tr>
+    <!--nested form-->
+    {% if form.nested %}
+        {{ form.nested.management_form }}
+        {{ form.nested.non_form_errors }}
+
+        {% for nested_form in form.nested.forms %}
+
+            <tr class="{% cycle 'row1' 'row2' %} formset_child-{{ formset.prefix }}"">
+                {% for field in nested_form.visible_fields %}
+                <td>
+                    {# Include the hidden fields in the nested_form #}
+                    {% if forloop.first %}
+                        {% for hidden in nested_form.hidden_fields %}
+                            {{ hidden }}
+                        {% endfor %}
+                    {% endif %}
+                    {{ field.errors.as_ul }}
+                    {{ field|as_crispy_field }}
+                </td>
+                {% endfor %}
             </tr>
+
+        {% endfor %}
+
+    {% endif %}
+    <!-- end of nested form-->
+
     {% endfor %}
 
 </table>
@@ -30,4 +58,11 @@
         deleteText: 'remove',
         prefix: '{{ formset.prefix }}',
     });
+</script>
+<script type="text/javascript">
+    $('.formset_child-{{ formset.prefix }}').formset({
+        addText: 'add child',
+        deleteText: 'remove',
+        prefix: '{{ formset.prefix }}',
+    });
 </script>

mycollections/views.py

@@ -56,6 +56,7 @@ def form_valid(self, form):
             if titles.is_valid():
                 titles.instance = self.object
                 titles.save()
+
         return super(CollectionCreate, self).form_valid(form)
 
     def get_success_url(self):