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from django import http
from django.db import models
from django.contrib.databrowse.datastructures import EasyModel
from django.contrib.databrowse.sites import DatabrowsePlugin
from django.shortcuts import render_to_response
from django.utils.text import capfirst
from django.utils.encoding import smart_str, force_unicode
from django.utils.safestring import mark_safe
import urllib
class FieldChoicePlugin(DatabrowsePlugin):
def __init__(self, field_filter=None):
# If field_filter is given, it should be a callable that takes a
# Django database Field instance and returns True if that field should
# be included. If field_filter is None, that all fields will be used.
self.field_filter = field_filter
def field_dict(self, model):
"""
Helper function that returns a dictionary of all fields in the given
model. If self.field_filter is set, it only includes the fields that
match the filter.
"""
if self.field_filter:
return dict([(f.name, f) for f in model._meta.fields if self.field_filter(f)])
else:
return dict([(f.name, f) for f in model._meta.fields if not f.rel and not f.primary_key and not f.unique and not isinstance(f, (models.AutoField, models.TextField))])
def model_index_html(self, request, model, site):
fields = self.field_dict(model)
if not fields:
return u''
return mark_safe(u'<p class="filter"><strong>View by:</strong> %s</p>' % \
u', '.join(['<a href="fields/%s/">%s</a>' % (f.name, force_unicode(capfirst(f.verbose_name))) for f in fields.values()]))
def urls(self, plugin_name, easy_instance_field):
if easy_instance_field.field in self.field_dict(easy_instance_field.model.model).values():
field_value = smart_str(easy_instance_field.raw_value)
return [mark_safe(u'%s%s/%s/%s/' % (
easy_instance_field.model.url(),
plugin_name, easy_instance_field.field.name,
urllib.quote(field_value, safe='')))]
def model_view(self, request, model_databrowse, url):
self.model, self.site = model_databrowse.model, model_databrowse.site
self.fields = self.field_dict(self.model)
# If the model has no fields with choices, there's no point in going
# further.
if not self.fields:
raise http.Http404('The requested model has no fields.')
if url is None:
return self.homepage_view(request)
url_bits = url.split('/', 1)
if self.fields.has_key(url_bits[0]):
return self.field_view(request, self.fields[url_bits[0]], *url_bits[1:])
raise http.Http404('The requested page does not exist.')
def homepage_view(self, request):
easy_model = EasyModel(self.site, self.model)
field_list = self.fields.values()
field_list.sort(key=lambda k: k.verbose_name)
return render_to_response('databrowse/fieldchoice_homepage.html', {'root_url': self.site.root_url, 'model': easy_model, 'field_list': field_list})
def field_view(self, request, field, value=None):
easy_model = EasyModel(self.site, self.model)
easy_field = easy_model.field(field.name)
if value is not None:
obj_list = easy_model.objects(**{field.name: value})
return render_to_response('databrowse/fieldchoice_detail.html', {'root_url': self.site.root_url, 'model': easy_model, 'field': easy_field, 'value': value, 'object_list': obj_list})
obj_list = [v[field.name] for v in self.model._default_manager.distinct().order_by(field.name).values(field.name)]
return render_to_response('databrowse/fieldchoice_list.html', {'root_url': self.site.root_url, 'model': easy_model, 'field': easy_field, 'object_list': obj_list})
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