- Author:
- marcosthomazs
- Posted:
- June 2, 2015
- Language:
- Python
- Version:
- 1.2
- Score:
- 0 (after 0 ratings)
This snippets generate the sum of the field values, for use in summary reports. More info in https://github.com/thomazs/django_templates_plus
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | # coding = utf-8
"""
Package containing functions to support the templates.
@author Marcos Thomaz da Silva - [email protected]
"""
__author__ = 'Marcos Thomaz da Silva - [email protected]'
class Cel(object):
"""
Class Helper used to store summaries
"""
value = uval = None
def __add__(self,val):
if self.value:
self.value = self.value + val
else:
self.value = val
self.uval = val
return val
def __str__(self):
return self.uval
def __unicode__(self):
return self.uval
@property
def total(self):
return self.value
def reset(self):
self.value = self.uval = None
return self
class VirtualSummary(object):
"""
Class to be instantiated in views and used within the templates.
Usage (only in django templates):
vs = VirtualSummary()
{{ vs.<your_field_to_summary> }} = Create a new virtual field to store the summary
{{ vs.<your_field_to_summary>|add:<value_to_sum> }} = Use the fielter "add"
to realize the sum.
{{ vs.total__<your_field_to_summary> }} = returns the result of the sum
{{ vs.reset__<your_field_to_summary> }} = reset the sum and
return None. Used
for realize summary
in groups/subgroups
Complete Example:
================================================
class Sale(models.Model):
product = models.ForeignKey(Product)
quantity = models.IntegerField()
value = models.DecimalField('Unitary Value', max_digits=7, decimal_places=2)
@property
def subtotal(self):
return self.quantity * self.value
def __unicode__(self):
return self.product.name
def myview(request):
vtable = VirtualSummary()
my_sales = Sale.objects.all()
return render(request, 'your_template.html' , locals())
======= your_template.html =====
<html>
<body>
<table>
<thead>
<tr>
<th>Product</th>
<th>Quantity</th><!-- {{ vtable.qty }} -->
<th>Un.Value</th><!-- {{ vtable.unval }} -->
<th>Subtotal</th><!-- {{ vtable.subtot }} -->
</tr>
</thead>
<tbody>
{% for sale in my_sales %}
<tr>
<td>{{ sale.product }}</td>
<td>{{ vtable.qty|add:sale.quantity }}</td>
<td>{{ vtable.unval|add:sale.value }}</td>
<td>{{ vtable.subtot|add:sale.subtotal }}</td>
</tr>
{% endfor %}
</tbody>
<tfooter>
<tr>
<th>Total</th>
<th>{{ vtable.total__qty }}</th>
<th>{{ vtable.total__unval }}</th>
<th>{{ vtable.total__subtot }}</th>
</tr>
</tfooter>
</table>
</body>
</html>
"""
__values = {}
# TODO Another operations: Subtraction, Average and Median
def __getattr__(self, name):
if name[:2] == '__' :
return super(VirtualSummary, self).__getattr__(name)
elif '__' in name:
data = name.split('__')
if data[0] == 'total':
return self.__values[data[1]].total
elif data[0] == 'reset':
return self.__values[data[1]].reset()
if not (name in self.__values):
self.__values[name] = Cel()
return self.__values[name]
|
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