Add "Feeding Amounts" report. (#68)

dashboard/templates/dashboard/child_button_group.html

@@ -18,6 +18,7 @@
         <div class="dropdown-menu" aria-labelledby="reports-dropdown">
             <a class="dropdown-item" href="{% url 'reports:report-diaperchange-types-child' object.slug %}">{% trans "Diaper Change Types" %}</a>
             <a class="dropdown-item" href="{% url 'reports:report-diaperchange-lifetimes-child' object.slug %}">{% trans "Diaper Lifetimes" %}</a>
+            <a class="dropdown-item" href="{% url 'reports:report-feeding-amounts-child' object.slug %}">{% trans "Feeding Amounts" %}</a>
             <a class="dropdown-item" href="{% url 'reports:report-feeding-duration-child' object.slug %}">{% trans "Feeding Durations (Average)" %}</a>
             <a class="dropdown-item" href="{% url 'reports:report-sleep-pattern-child' object.slug %}">{% trans "Sleep Pattern" %}</a>
             <a class="dropdown-item" href="{% url 'reports:report-sleep-totals-child' object.slug %}">{% trans "Sleep Totals" %}</a>

reports/graphs/__init__.py

@@ -1,5 +1,6 @@
 from .diaperchange_lifetimes import diaperchange_lifetimes  # NOQA
 from .diaperchange_types import diaperchange_types  # NOQA
+from .feeding_amounts import feeding_amounts  # NOQA
 from .feeding_duration import feeding_duration  # NOQA
 from .sleep_pattern import sleep_pattern  # NOQA
 from .sleep_totals import sleep_totals  # NOQA

reports/graphs/feeding_amounts.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+from django.db.models import Sum
+from django.db.models.functions import TruncDate
+from django.utils.translation import gettext as _
+
+import plotly.offline as plotly
+import plotly.graph_objs as go
+
+from reports import utils
+
+
+def feeding_amounts(instances):
+    """
+    Create a graph showing daily feeding amounts over time.
+    :param instances: a QuerySet of Feeding instances.
+    :returns: a tuple of the the graph's html and javascript.
+    """
+    totals = instances.annotate(date=TruncDate('start')) \
+        .values('date') \
+        .annotate(sum=Sum('amount')) \
+        .order_by('-date')
+
+    dates = [value['date'] for value in totals.values('date')]
+    amounts = [value['amount'] or 0 for value in totals.values('amount')]
+
+    trace = go.Bar(
+        name=_('Total feeding amount'),
+        x=dates,
+        y=amounts,
+        hoverinfo='text',
+        textposition='outside',
+        text=amounts
+    )
+
+    layout_args = utils.default_graph_layout_options()
+    layout_args['title'] = _('<b>Total Feeding Amounts</b>')
+    layout_args['xaxis']['title'] = _('Date')
+    layout_args['xaxis']['rangeselector'] = utils.rangeselector_date()
+    layout_args['yaxis']['title'] = _('Feeding amount')
+
+    fig = go.Figure({
+        'data': [trace],
+        'layout': go.Layout(**layout_args)
+    })
+    output = plotly.plot(fig, output_type='div', include_plotlyjs=False)
+    return utils.split_graph_output(output)

reports/templates/reports/feeding_amounts.html

@@ -0,0 +1,9 @@
+{% extends 'reports/report_base.html' %}
+{% load i18n %}
+
+{% block title %}{% trans "Feeding Amounts" %} - {{ object }}{% endblock %}
+
+{% block breadcrumbs %}
+    {{ block.super }}
+    <li class="breadcrumb-item active" aria-current="page">{% trans "Feeding Amounts" %}</li>
+{% endblock %}

reports/tests/tests_views.py

@@ -38,6 +38,8 @@ class ViewsTestCase(TestCase):
         page = self.c.get('{}/changes/types/'.format(base_url))
         self.assertEqual(page.status_code, 200)
 
+        page = self.c.get('{}/feeding/amounts/'.format(base_url))
+        self.assertEqual(page.status_code, 200)
         page = self.c.get('{}/feeding/duration/'.format(base_url))
         self.assertEqual(page.status_code, 200)
 

reports/urls.py

@@ -16,6 +16,11 @@ urlpatterns = [
         views.DiaperChangeTypesChildReport.as_view(),
         name='report-diaperchange-types-child'
     ),
+    path(
+        'children/<slug:slug>/reports/feeding/amounts/',
+        views.FeedingAmountsChildReport.as_view(),
+        name='report-feeding-amounts-child'
+    ),
     path(
         'children/<slug:slug>/reports/feeding/duration/',
         views.FeedingDurationChildReport.as_view(),

reports/views.py

@@ -45,6 +45,29 @@ class DiaperChangeTypesChildReport(PermissionRequired403Mixin, DetailView):
         return context
 
 
+class FeedingAmountsChildReport(PermissionRequired403Mixin, DetailView):
+    """
+    Graph of daily feeding amounts over time.
+    """
+    model = models.Child
+    permission_required = ('core.view_child',)
+    template_name = 'reports/feeding_amounts.html'
+
+    def __init__(self):
+        super(FeedingAmountsChildReport, self).__init__()
+        self.html = ''
+        self.js = ''
+
+    def get_context_data(self, **kwargs):
+        context = super(FeedingAmountsChildReport, self).get_context_data(
+            **kwargs)
+        child = context['object']
+        instances = models.Feeding.objects.filter(child=child)
+        if instances:
+            context['html'], context['js'] = graphs.feeding_amounts(instances)
+        return context
+
+
 class FeedingDurationChildReport(PermissionRequired403Mixin, DetailView):
     """
     Graph of feeding durations over time.
@@ -56,7 +79,7 @@ class FeedingDurationChildReport(PermissionRequired403Mixin, DetailView):
     def __init__(self):
         super(FeedingDurationChildReport, self).__init__()
         self.html = ''
-        self.javascript = ''
+        self.js = ''
 
     def get_context_data(self, **kwargs):
         context = super(FeedingDurationChildReport, self).get_context_data(
@@ -79,7 +102,7 @@ class SleepPatternChildReport(PermissionRequired403Mixin, DetailView):
     def __init__(self):
         super(SleepPatternChildReport, self).__init__()
         self.html = ''
-        self.javascript = ''
+        self.js = ''
 
     def get_context_data(self, **kwargs):
         context = super(SleepPatternChildReport, self).get_context_data(
@@ -102,7 +125,7 @@ class SleepTotalsChildReport(PermissionRequired403Mixin, DetailView):
     def __init__(self):
         super(SleepTotalsChildReport, self).__init__()
         self.html = ''
-        self.javascript = ''
+        self.js = ''
 
     def get_context_data(self, **kwargs):
         context = super(SleepTotalsChildReport, self).get_context_data(