app/django/contrib/databrowse/sites.py
author Mario Ferraro <fadinlight@gmail.com>
Sun, 15 Nov 2009 22:12:20 +0100
changeset 3093 d1be59b6b627
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.
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from django import http
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from django.db import models
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from django.contrib.databrowse.datastructures import EasyModel
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from django.shortcuts import render_to_response
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from django.utils.safestring import mark_safe
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class AlreadyRegistered(Exception):
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    pass
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class NotRegistered(Exception):
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    pass
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class DatabrowsePlugin(object):
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    def urls(self, plugin_name, easy_instance_field):
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        """
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        Given an EasyInstanceField object, returns a list of URLs for this
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        plugin's views of this object. These URLs should be absolute.
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        Returns None if the EasyInstanceField object doesn't get a
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        list of plugin-specific URLs.
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        """
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        return None
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    def model_index_html(self, request, model, site):
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        """
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        Returns a snippet of HTML to include on the model index page.
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        """
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        return ''
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    def model_view(self, request, model_databrowse, url):
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        """
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        Handles main URL routing for a plugin's model-specific pages.
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        """
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        raise NotImplementedError
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class ModelDatabrowse(object):
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    plugins = {}
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    def __init__(self, model, site):
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        self.model = model
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        self.site = site
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    def root(self, request, url):
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        """
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        Handles main URL routing for the databrowse app.
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        `url` is the remainder of the URL -- e.g. 'objects/3'.
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        """
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        # Delegate to the appropriate method, based on the URL.
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        if url is None:
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            return self.main_view(request)
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        try:
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            plugin_name, rest_of_url = url.split('/', 1)
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        except ValueError: # need more than 1 value to unpack
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            plugin_name, rest_of_url = url, None
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        try:
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            plugin = self.plugins[plugin_name]
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        except KeyError:
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            raise http.Http404('A plugin with the requested name does not exist.')
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        return plugin.model_view(request, self, rest_of_url)
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    def main_view(self, request):
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        easy_model = EasyModel(self.site, self.model)
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        html_snippets = mark_safe(u'\n'.join([p.model_index_html(request, self.model, self.site) for p in self.plugins.values()]))
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        return render_to_response('databrowse/model_detail.html', {
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            'model': easy_model,
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            'root_url': self.site.root_url,
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            'plugin_html': html_snippets,
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        })
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class DatabrowseSite(object):
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    def __init__(self):
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        self.registry = {} # model_class -> databrowse_class
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        self.root_url = None
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    def register(self, model_or_iterable, databrowse_class=None, **options):
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        """
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        Registers the given model(s) with the given databrowse site.
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        The model(s) should be Model classes, not instances.
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        If a databrowse class isn't given, it will use DefaultModelDatabrowse
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        (the default databrowse options).
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        If a model is already registered, this will raise AlreadyRegistered.
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        """
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        databrowse_class = databrowse_class or DefaultModelDatabrowse
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        if issubclass(model_or_iterable, models.Model):
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            model_or_iterable = [model_or_iterable]
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        for model in model_or_iterable:
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            if model in self.registry:
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                raise AlreadyRegistered('The model %s is already registered' % model.__name__)
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            self.registry[model] = databrowse_class
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    def unregister(self, model_or_iterable):
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        """
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        Unregisters the given model(s).
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        If a model isn't already registered, this will raise NotRegistered.
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        """
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        if issubclass(model_or_iterable, models.Model):
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            model_or_iterable = [model_or_iterable]
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        for model in model_or_iterable:
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            if model not in self.registry:
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                raise NotRegistered('The model %s is not registered' % model.__name__)
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            del self.registry[model]
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    def root(self, request, url):
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        """
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        Handles main URL routing for the databrowse app.
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        `url` is the remainder of the URL -- e.g. 'comments/comment/'.
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        """
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        self.root_url = request.path[:len(request.path) - len(url)]
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        url = url.rstrip('/') # Trim trailing slash, if it exists.
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        if url == '':
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            return self.index(request)
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        elif '/' in url:
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            return self.model_page(request, *url.split('/', 2))
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        raise http.Http404('The requested databrowse page does not exist.')
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    def index(self, request):
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        m_list = [EasyModel(self, m) for m in self.registry.keys()]
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        return render_to_response('databrowse/homepage.html', {'model_list': m_list, 'root_url': self.root_url})
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    def model_page(self, request, app_label, model_name, rest_of_url=None):
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        """
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        Handles the model-specific functionality of the databrowse site, delegating
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        to the appropriate ModelDatabrowse class.
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        """
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        model = models.get_model(app_label, model_name)
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        if model is None:
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            raise http.Http404("App %r, model %r, not found." % (app_label, model_name))
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        try:
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            databrowse_class = self.registry[model]
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        except KeyError:
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            raise http.Http404("This model exists but has not been registered with databrowse.")
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        return databrowse_class(model, self).root(request, rest_of_url)
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site = DatabrowseSite()
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from django.contrib.databrowse.plugins.calendars import CalendarPlugin
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from django.contrib.databrowse.plugins.objects import ObjectDetailPlugin
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from django.contrib.databrowse.plugins.fieldchoices import FieldChoicePlugin
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class DefaultModelDatabrowse(ModelDatabrowse):
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    plugins = {'objects': ObjectDetailPlugin(), 'calendars': CalendarPlugin(), 'fields': FieldChoicePlugin()}