GROUPPING BANDS
===============

This is a simple test for groupping bands. We must have support to multiple
groups in a report.

Groupping is something like this:

- Country
 - City
  - Soccer team

As you can see above we have 2 grouppings: by country and by city (under
country).

In this test we work with users as following:

- If staff
 - If superuser
  - User

    >>> import os
    >>> cur_dir = os.path.dirname(os.path.abspath(__file__))

    >>> from django.contrib.auth.models import User

    >>> from reportlab.lib.pagesizes import A4
    >>> from reportlab.lib.units import cm
    >>> from reportlab.lib.enums import TA_CENTER, TA_JUSTIFY
    >>> from reportlab.lib.colors import navy, yellow, red
    
    >>> from geraldo import Report, ReportBand, Label, ObjectValue, SystemField,\
    ...     FIELD_ACTION_COUNT, FIELD_ACTION_SUM, BAND_WIDTH, Line, ReportGroup

Report class

    >>> class GrouppingReport(Report):
    ...     title = 'Groupping demonstration'
    ... 
    ...     class band_summary(ReportBand):
    ...         height = 0.8*cm
    ...         elements = [
    ...             Label(text="Users count:", top=0.1*cm, left=0),
    ...             ObjectValue(attribute_name='id', top=0.1*cm, left=4*cm,\
    ...                 action=FIELD_ACTION_COUNT, display_format='%s users found'),
    ...         ]
    ...         borders = {'all': True}
    ... 
    ...     class band_page_header(ReportBand):
    ...         height = 1.3*cm
    ...         elements = [
    ...             SystemField(expression='%(report_title)s', top=0.1*cm, left=0, width=BAND_WIDTH,
    ...                 style={'fontName': 'Helvetica-Bold', 'fontSize': 14, 'alignment': TA_CENTER}),
    ...             Label(text="ID", top=0.8*cm, left=0),
    ...             Label(text="Username", top=0.8*cm, left=3*cm),
    ...             Label(text="First name", top=0.8*cm, left=8*cm),
    ...             Label(text="Superuser", top=0.8*cm, left=13*cm),
    ...             Label(text="Staff", top=0.8*cm, left=18*cm),
    ...         ]
    ...         borders = {'bottom': Line(stroke_color=red, stroke_width=3)}
    ... 
    ...     class band_page_footer(ReportBand):
    ...         height = 0.5*cm
    ...         elements = [
    ...             Label(text='Created with Geraldo Reports', top=0.1*cm),
    ...         ]
    ...         borders = {'top': Line(stroke_color=navy)}
    ... 
    ...     class band_detail(ReportBand):
    ...         height = 0.7*cm
    ...         elements = [
    ...             ObjectValue(attribute_name='id', top=0, left=1*cm),
    ...             ObjectValue(attribute_name='username', top=0, left=3*cm),
    ...             ObjectValue(attribute_name='first_name', top=0, left=8*cm),
    ...             ObjectValue(attribute_name='is_superuser', top=0, left=13*cm,
    ...                 get_value=lambda instance: instance.is_superuser and 'Yes' or 'No'),
    ...             ObjectValue(attribute_name='is_staff', top=0, left=18*cm,
    ...                 get_value=lambda instance: instance.is_staff and 'Yes' or 'No'),
    ...         ]
    ... 
    ...     groups = [
    ...         ReportGroup(attribute_name='is_superuser', 
    ...             band_header=ReportBand(
    ...                 height=0.7*cm,
    ...                 elements=[
    ...                     ObjectValue(attribute_name='is_superuser', left=0, top=0.1*cm,
    ...                         get_value=lambda instance: 'Superuser: ' + (instance.is_superuser and 'Yes' or 'No'),
    ...                         style={'fontName': 'Helvetica-Bold', 'fontSize': 12})
    ...                 ],
    ...                 borders={'bottom': True},
    ...             ),
    ...             band_footer=ReportBand(
    ...                 height=0.7*cm,
    ...                 elements=[
    ...                     ObjectValue(attribute_name='id', action=FIELD_ACTION_COUNT,
    ...                         display_format='%s superusers', left=0*cm, top=0.1*cm),
    ...                     ObjectValue(attribute_name='id', action=FIELD_ACTION_SUM,
    ...                         display_format='%s is the sum of IDs above', left=4*cm, top=0.1*cm),
    ...                 ],
    ...                 borders={'top': True},
    ...             ),
    ...         ),
    ...         ReportGroup(attribute_name='is_staff', 
    ...             band_header=ReportBand(
    ...                 height=0.7*cm,
    ...                 elements=[
    ...                     ObjectValue(attribute_name='is_staff', left=0.5*cm, top=0.1*cm,
    ...                         get_value=lambda instance: 'Staff: ' + (instance.is_staff and 'Yes' or 'No'))
    ...                 ],
    ...                 borders={'bottom': True},
    ...             ),
    ...             band_footer=ReportBand(
    ...                 height=0.7*cm,
    ...                 elements=[
    ...                     ObjectValue(attribute_name='id', action=FIELD_ACTION_COUNT,
    ...                         display_format='%s staffs', left=0.5*cm, top=0.1*cm)
    ...                 ],
    ...                 borders={'top': True},
    ...             ),
    ...         ),
    ...     ]

    >>> queryset = User.objects.order_by('is_superuser','is_staff','id')

    >>> report = GrouppingReport(queryset=queryset)

PDF common generation with users

    >>> from geraldo.generators import PDFGenerator

    >>> report.generate_by(PDFGenerator, filename=os.path.join(cur_dir, 'groupping-report.pdf'))

Page with half height

    >>> report.page_size = (A4[0], A4[1] / 2)
    >>> report.generate_by(PDFGenerator, filename=os.path.join(cur_dir, 'groupping-report-half-height.pdf'))

Page with half height with new group in the begin of second page

    >>> report.queryset = report.queryset.exclude(username='Betty')
    >>> report.generate_by(PDFGenerator, filename=os.path.join(cur_dir, 'groupping-report-half-height-2.pdf'))

