Ability to delete part

- Provides confirmation form
- Shows the flow-on effects (model.CASCADE) from deleting this part
- Bootstrap makes it prettyful

InvenTree/part/migrations/0013_auto_20180414_2238.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2018-04-14 22:38
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0012_auto_20180414_1032'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='part',
+            name='name',
+            field=models.CharField(max_length=100, unique=True),
+        ),
+        migrations.AlterUniqueTogether(
+            name='part',
+            unique_together=set([]),
+        ),
+    ]

InvenTree/part/models.py

@@ -77,12 +77,14 @@ class Part(models.Model):
         return '/part/{id}/'.format(id=self.id)
 
     # Short name of the part
-    name = models.CharField(max_length=100)
+    name = models.CharField(max_length=100, unique=True)
 
     # Longer description of the part (optional)
     description = models.CharField(max_length=250, blank=True)
 
     # Internal Part Number (optional)
+    # Potentially multiple parts map to the same internal IPN (variants?)
+    # So this does not have to be unique
     IPN = models.CharField(max_length=100, blank=True)
 
     # Provide a URL for an external link
@@ -117,7 +119,7 @@ class Part(models.Model):
     class Meta:
         verbose_name = "Part"
         verbose_name_plural = "Parts"
-        unique_together = (("name", "category"),)
+        #unique_together = (("name", "category"),)
 
     @property
     def stock(self):

InvenTree/part/templates/base.html

@@ -9,7 +9,8 @@
 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 
 <!-- Bootstrap CSS -->
-<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
+
+<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
 
 <!-- Local stylesheet -->
 <link rel="stylesheet" href="{% static 'css/inventree.css' %}">
@@ -31,7 +32,7 @@ InvenTree
 
 {% include "navbar.html" %}
 
-<div class="inventree-content">
+<div class="container-fluid inventree-content">
 {% block content %}
 <!-- Each view fills in here.. -->
 {% endblock %}

InvenTree/part/templates/part/delete.html

@@ -1,2 +1,51 @@
 {% extends 'part/part_base.html' %}
 
+{% block details %}
+
+<div class="panel panel-danger">
+    <div class="panel-heading">Are you sure you want to delete part '{{ part.name }}'?</div>
+    <div class="panel-body">
+
+    <p><b>Deleting this part is a permanent action and cannot be undone.</b></p>
+
+    {% if part.usedInCount > 0 %}
+    <p>This part is used in BOMs for {{ part.usedInCount }} other parts. If you delete this part, the BOMs for the following parts will be updated:
+    <ul class="list-group">
+        {% for child in part.used_in.all %}
+        <li class='list-group-item'>{{ child.part.name }} - {{ child.part.description }}</li>
+        {% endfor %}
+    </p>
+    {% endif %}
+
+    {% if part.locations.all|length > 0 %}
+    <p>There are {{ part.locations.all|length }} stock entries defined for this part. If you delete this part, the following stock entries will also be deleted:
+        <ul class='list-group'>
+            {% for stock in part.locations.all %}
+            <li class='list-group-item'>{{ stock.location.name }} - {{ stock.quantity }} items</li>
+            {% endfor %}
+        </ul>
+    </p>
+    {% endif %}
+
+    {% if part.supplier_parts.all|length > 0 %}
+    <p>There are {{ part.supplier_parts.all|length }} suppliers defined for this part. If you delete this part, the following supplier parts will also be deleted.
+        <ul class='list-group'>
+            {% for spart in part.supplier_parts.all %}
+            <li class='list-group-item'>{{ spart.supplier.name }} - {{ spart.SKU }}</li>
+            {% endfor %}
+        </ul>
+    </p>
+    {% endif %}
+
+    {% if part.serials.all|length > 0 %}
+    <p>There are {{ part.serials.all|length }} unique parts tracked for '{{ part.name }}'. Deleting this part will permanently remove this tracking information.</p>
+    {% endif %}
+
+  <form action="" method="post">{% csrf_token %}
+    <input type="submit" name='confirm' value="Confirm" />
+    <input type="submit" name="cancel" value="Cancel" />
+  </form>
+
+ </div>
+</div>
+{% endblock %}

InvenTree/part/urls.py

@@ -40,7 +40,7 @@ bom_api_urls = [
 
 part_detail_urls = [
     url(r'^edit/?', views.PartEdit.as_view(), name='part-edit'),
-    url(r'^delete/?', views.delete, name='part-delete'),
+    url(r'^delete/?', views.PartDelete.as_view(), name='part-delete'),
     url(r'^track/?', views.PartDetail.as_view(template_name='part/track.html'), name='part-track'),
     url(r'^bom/?', views.PartDetail.as_view(template_name='part/bom.html'), name='part-bom'),
     url(r'^stock/?', views.PartDetail.as_view(template_name='part/stock.html'), name='part-stock'),

InvenTree/part/views.py

@@ -6,7 +6,7 @@ from django.http import HttpResponseRedirect
 from django.urls import reverse
 
 from django.views.generic import DetailView, ListView
-from django.views.generic.edit import UpdateView
+from django.views.generic.edit import UpdateView, DeleteView, CreateView
 
 from .forms import EditPartForm
 
@@ -46,5 +46,15 @@ class PartEdit(UpdateView):
     template_name = 'part/edit.html'
 
 
-def delete(request, pk):
+class PartDelete(DeleteView):
-    return HttpResponseRedirect('/part/{pk}/'.format(pk=pk))
+    model = Part
+    template_name = 'part/delete.html'
+
+    success_url = '/part/'
+
+    def post(self, request, *args, **kwargs):
+        if 'confirm' in request.POST:
+            return super(PartDelete, self).post(request, *args, **kwargs)
+        else:
+            return HttpResponseRedirect(self.get_object().get_absolute_url())
+

InvenTree/static/css/inventree.css

@@ -117,4 +117,18 @@ table tr:nth-child(odd) {
   border: 1px solid #ddd;
   border-bottom-color: transparent;
   cursor: default;
-}
+}
+
+.panel-danger {
+    border-radius: 5px;
+    padding: 5px;
+    margin: 5px;
+    border-color: #ebccd1;
+}
+
+.panel-danger>.panel-heading {
+    background-color: #ebccd1;
+    border-top-left-radius: 3px;
+    border-top-right-radius: 3px;
+}
+