Add 'REPORT_DEBUG_MODE' setting

- If set, reports are printed in raw HTML
- Not pretty, but useful for debugging output of rendered template

InvenTree/common/models.py

@@ -174,6 +174,13 @@ class InvenTreeSetting(models.Model):
             'validator': bool,
         },
 
+        'REPORT_DEBUG_MODE': {
+            'name': _('Debug Mode'),
+            'description': _('Generate reports in debug mode (HTML output)'),
+            'default': False,
+            'validator': bool,
+        },
+
         'REPORT_DEFAULT_PAGE_SIZE': {
             'name': _('Page Size'),
             'description': _('Default page size for PDF reports'),

InvenTree/report/api.py

@@ -3,12 +3,14 @@ from __future__ import unicode_literals
 
 from django.utils.translation import ugettext as _
 from django.conf.urls import url, include
+from django.http import HttpResponse
 
 from django_filters.rest_framework import DjangoFilterBackend
 
 from rest_framework import generics, filters
 from rest_framework.response import Response
 
+import common.models
 import InvenTree.helpers
 
 from stock.models import StockItem
@@ -165,31 +167,54 @@ class StockItemTestReportPrint(generics.RetrieveAPIView, StockItemReportMixin):
 
         outputs = []
 
+        # In debug mode, generate single HTML output, rather than PDF
+        debug_mode = common.models.InvenTreeSetting.get_setting('REPORT_DEBUG_MODE')
+
         # Merge one or more PDF files into a single download
         for item in items:
             report = self.get_object()
             report.stock_item = item
 
-            outputs.append(report.render(request))
+            if debug_mode:
+                outputs.append(report.render_to_string(request))
+            else:
+                outputs.append(report.render(request))
 
-        pages = []
 
-        if len(outputs) > 1:
-            # If more than one output is generated, merge them into a single file
-            for output in outputs:
-                doc = output.get_document()
-                for page in doc.pages:
-                    pages.append(page)
+        if debug_mode:
+            """
+            Contatenate all rendered templates into a single HTML string,
+            and return the string as a HTML response.
+            """
+
+            html = "\n".join(outputs)
+
+            return HttpResponse(html)
 
-            pdf = outputs[0].get_document().copy(pages).write_pdf()
         else:
-            pdf = outputs[0].get_document().write_pdf()
+            """
+            Concatenate all rendered pages into a single PDF object,
+            and return the resulting document!
+            """
 
-        return InvenTree.helpers.DownloadFile(
-            pdf,
-            'test_report.pdf',
-            content_type='application/pdf'
-        )
+            pages = []
+
+            if len(outputs) > 1:
+                # If more than one output is generated, merge them into a single file
+                for output in outputs:
+                    doc = output.get_document()
+                    for page in doc.pages:
+                        pages.append(page)
+
+                pdf = outputs[0].get_document().copy(pages).write_pdf()
+            else:
+                pdf = outputs[0].get_document().write_pdf()
+
+            return InvenTree.helpers.DownloadFile(
+                pdf,
+                'test_report.pdf',
+                content_type='application/pdf'
+            )
 
 
 report_api_urls = [

InvenTree/report/models.py

@@ -14,6 +14,8 @@ import datetime
 from django.db import models
 from django.conf import settings
 
+from django.template.loader import render_to_string
+
 from django.core.files.storage import FileSystemStorage
 from django.core.validators import FileExtensionValidator
 
@@ -175,16 +177,11 @@ class ReportTemplateBase(ReportBase):
 
         return {}
 
-    def render(self, request, **kwargs):
+    def context(self, request):
         """
-        Render the template to a PDF file.
-
-        Uses django-weasyprint plugin to render HTML template against Weasyprint
+        All context to be passed to the renderer.
         """
 
-        # TODO: Support custom filename generation!
-        # filename = kwargs.get('filename', 'report.pdf')
-
         context = self.get_context_data(request)
 
         context['date'] = datetime.datetime.now().date()
@@ -196,6 +193,27 @@ class ReportTemplateBase(ReportBase):
         context['request'] = request
         context['user'] = request.user
 
+        return context
+
+    def render_to_string(self, request, **kwargs):
+        """
+        Render the report to a HTML stiring.
+
+        Useful for debug mode (viewing generated code)
+        """
+
+        return render_to_string(self.template_name, self.context(request), request)
+
+    def render(self, request, **kwargs):
+        """
+        Render the template to a PDF file.
+
+        Uses django-weasyprint plugin to render HTML template against Weasyprint
+        """
+
+        # TODO: Support custom filename generation!
+        # filename = kwargs.get('filename', 'report.pdf')
+
         # Render HTML template to PDF
         wp = WeasyprintReportMixin(
             request,
@@ -205,7 +223,7 @@ class ReportTemplateBase(ReportBase):
             **kwargs)
 
         return wp.render_to_response(
-            context,
+            self.context(request),
             **kwargs)
 
     enabled = models.BooleanField(

InvenTree/report/templates/report/inventree_test_report.html

@@ -50,6 +50,10 @@ content: "{% trans 'Stock Item Test Report' %}";
     width: 50%;
 }
 
+.part-img {
+    height: 4cm;
+}
+
 {% endblock %}
 
 {% block page_content %}
@@ -64,7 +68,7 @@ content: "{% trans 'Stock Item Test Report' %}";
         <p><i>Stock Item ID: {{ stock_item.pk }}</i></p>
     </div>
     <div class='img-right'>
-        <img src="{% part_image part %}">
+        <img class='part-img' src="{% part_image part %}">
         <hr>
         <h4>
             {% if stock_item.is_serialized %}

InvenTree/templates/InvenTree/settings/report.html

@@ -16,6 +16,7 @@
     {% include "InvenTree/settings/header.html" %}
     <tbody>
         {% include "InvenTree/settings/setting.html" with key="REPORT_DEFAULT_PAGE_SIZE" %}
+        {% include "InvenTree/settings/setting.html" with key="REPORT_DEBUG_MODE" %}
         {% include "InvenTree/settings/setting.html" with key="REPORT_ENABLE_TEST_REPORT" %}
     </tbody>
 </table>