SUBREPORTS
==========

YET IN DEVELOPMENT PROCESS

This is they best way to have a master/detail structure in a report. Its logic
is: you have a detail band that shows object details and subreports to show
ManyToMany or ManyRelated objects, like children.

This is diferent from ChildBand. SubReport is to show object child items in the
report, not as band childs.

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

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

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

Report class

    >>> class GrouppingReport(Report):
    ...     title = 'Subreports 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 = {'top': Line(stroke_color=red, stroke_width=3)}
    ... 
    ...     class band_page_header(ReportBand):
    ...         height = 0.8*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}),
    ...             SystemField(expression='Page # %(page_number)d of %(page_count)d', top=0.1*cm,
    ...                 width=BAND_WIDTH, style={'alignment': TA_RIGHT}),
    ...         ]
    ...         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),
    ...             SystemField(expression='Printed in %(now:%Y, %b %d)s at %(now:%H:%M)s', top=0.1*cm,
    ...                 width=BAND_WIDTH, style={'alignment': TA_RIGHT}),
    ...         ]
    ...         borders = {'top': Line(stroke_color=navy)}
    ... 
    ...     class band_detail(ReportBand):
    ...         height = 2*cm
    ...         elements = [
    ...             Label(text="Username", top=0, left=0, style={'fontName': 'Helvetica-Bold', 'fontSize': 14}),
    ...             Label(text="First name", top=1*cm, left=0.2*cm, style={'fontName': 'Helvetica-Bold'}),
    ...             Label(text="Superuser", top=1.5*cm, left=0.2*cm, style={'fontName': 'Helvetica-Bold'}),
    ...             ObjectValue(attribute_name='username', top=0, left=4*cm, style={'fontName': 'Helvetica', 'fontSize': 14}),
    ...             ObjectValue(attribute_name='first_name', top=1*cm, left=4*cm, style={'fontName': 'Helvetica'}),
    ...             ObjectValue(attribute_name='last_name', top=1.5*cm, left=4*cm, style={'fontName': 'Helvetica'}),
    ...         ]
    ...         borders = {'bottom': Line(stroke_color=navy)}
    ... 
    ...     subreports = [
    ...         SubReport(
    ...             queryset_string = '%(object)s.user_permissions.all()',
    ...             detail_band = ReportBand(
    ...                     height=0.5*cm,
    ...                     elements=[
    ...                         ObjectValue(attribute_name='id', top=0, left=0),
    ...                         ObjectValue(attribute_name='name', top=0, left=4*cm),
    ...                     ]
    ...                 ),
    ...         ),
    ...     ]

Setting permissions

    >>> u1 = User.objects.get(id=1)
    >>> for perm in Permission.objects.all()[:25]:
    ...     u1.user_permissions.add(perm)

    >>> u5 = User.objects.get(id=5)
    >>> for perm in Permission.objects.all()[:5]:
    ...     u5.user_permissions.add(perm)

Initializing report

    >>> queryset = User.objects.order_by('username')

    >>> report = GrouppingReport(queryset=queryset)

PDF common generation with users

    >>> from geraldo.generators import PDFGenerator

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

Page with half height

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

