基于Python和Django的在线课程教育平台设计源码

from __future__ import absolute_import from collections import OrderedDict from django.core.exceptions import PermissionDenied, ObjectDoesNotExist from django.core.paginator import InvalidPage, Paginator from django.core.urlresolvers import NoReverseMatch from django.db import models from django.http import HttpResponseRedirect from django.template.response import SimpleTemplateResponse, TemplateResponse from django.utils import six from django.utils.encoding import force_text, smart_text from django.utils.html import escape, conditional_escape from django.utils.safestring import mark_safe from django.utils.text import capfirst from django.utils.translation import ugettext as _ from xadmin.util import lookup_field, display_for_field, label_for_field, boolean_icon from .base import ModelAdminView, filter_hook, inclusion_tag, csrf_protect_m # List settings ALL_VAR = 'all' ORDER_VAR = 'o' PAGE_VAR = 'p' TO_FIELD_VAR = 't' COL_LIST_VAR = '_cols' ERROR_FLAG = 'e' DOT = '.' # Text to display within change-list table cells if the value is blank. EMPTY_CHANGELIST_VALUE = _('Null') class FakeMethodField(object): """ This class used when a column is an model function, wrap function as a fake field to display in select columns. """ def __init__(self, name, verbose_name): # Initial comm field attrs self.name = name self.verbose_name = verbose_name self.primary_key = False class ResultRow(dict): pass class ResultItem(object): def __init__(self, field_name, row): self.classes = [] self.text = '&nbsp;' self.wraps = [] self.tag = 'td' self.tag_attrs = [] self.allow_tags = False self.btns = [] self.menus = [] self.is_display_link = False self.row = row self.field_name = field_name self.field = None self.attr = None self.value = None @property def label(self): text = mark_safe( self.text) if self.allow_tags else conditional_escape(self.text) if force_text(text) == '': text = mark_safe('&nbsp;') for wrap in self.wraps: text = mark_safe(wrap % text) return text @property def tagattrs(self): return mark_safe( '%s%s' % ((self.tag_attrs and ' '.join(self.tag_attrs) or ''), (self.classes and (' class="%s"' % ' '.join(self.classes)) or ''))) class ResultHeader(ResultItem): def __init__(self, field_name, row): super(ResultHeader, self).__init__(field_name, row) self.tag = 'th' self.tag_attrs = ['scope="col"'] self.sortable = False self.allow_tags = True self.sorted = False self.ascending = None self.sort_priority = None self.url_primary = None self.url_remove = None self.url_toggle = None class ListAdminView(ModelAdminView): """ Display models objects view. this class has ordering and simple filter features. """ list_display = ('__str__',) list_display_links = () list_display_links_details = False list_select_related = None list_per_page = 50 list_max_show_all = 200 list_exclude = () search_fields = () paginator_class = Paginator ordering = None # Change list templates object_list_template = None def init_request(self, *args, **kwargs): if not self.has_view_permission(): raise PermissionDenied request = self.request request.session['LIST_QUERY'] = (self.model_info, self.request.META['QUERY_STRING']) self.pk_attname = self.opts.pk.attname self.lookup_opts = self.opts self.list_display = self.get_list_display() self.list_display_links = self.get_list_display_links() # Get page number parameters from the query string. try: self.page_num = int(request.GET.get(PAGE_VAR, 0)) except ValueError: self.page_num = 0 # Get params from request self.show_all = ALL_VAR in request.GET self.to_field = request.GET.get(TO_FIELD_VAR) self.params = dict(request.GET.items()) if PAGE_VAR in self.params: del self.params[PAGE_VAR] if ERROR_FLAG in self.params: del self.params[ERROR_FLAG] @filter_hook def get_list_display(self): """ Return a sequence containing the fields to be displayed on the list. """ self.base_list_display = (COL_LIST_VAR in self.request.GET and self.request.GET[COL_LIST_VAR] != "" and \ self.request.GET[COL_LIST_VAR].split('.')) or self.list_display return list(self.base_list_display) @filter_hook def get_list_display_links(self): """ Return a sequence containing the fields to be displayed as links on the changelist. The list_display parameter is the list of fields returned by get_list_display(). """ if self.list_display_links or not self.list_display: return self.list_display_links else: # Use only the first item in list_display as link return list(self.list_display)[:1] def make_result_list(self): # Get search parameters from the query string. self.base_queryset = self.queryset() self.list_queryset = self.get_list_queryset() self.ordering_field_columns = self.get_ordering_field_columns() self.paginator = self.get_paginator() # Get the number of objects, with admin filters applied. self.result_count = self.paginator.count # Get the total number of objects, with no admin filters applied. # Perform a slight optimization: Check to see whether any filters were # given. If not, use paginator.hits to calculate the number of objects, # because we've already done paginator.hits and the value is cached. if not self.list_queryset.query.where: self.full_result_count = self.result_count else: self.full_result_count = self.base_queryset.count() self.can_show_all = self.result_count <= self.list_max_show_all self.multi_page = self.result_count > self.list_per_page # Get the list of objects to display on this page. if (self.show_all and self.can_show_all) or not self.multi_page: self.result_list = self.list_queryset._clone() else: try: self.result_list = self.paginator.page( self.page_num + 1).object_list except InvalidPage: if ERROR_FLAG in self.request.GET.keys(): return SimpleTemplateResponse('xadmin/views/invalid_setup.html', { 'title': _('Database error'), }) return HttpResponseRedirect(self.request.path + '?' + ERROR_FLAG + '=1') self.has_more = self.result_count > ( self.list_per_page * self.page_num + len(self.result_list)) @filter_hook def get_result_list(self): return self.make_result_list() @filter_hook def post_result_list(self): return self.make_result_list() @filter_hook def get_list_queryset(self): """ Get model queryset. The query has been filted and ordered. """ # First, get queryset from base class. queryset = self.queryset() # Use select_related() if one of the list_display options is a field # with a relationship and the provided queryset doesn't already have # select_related defined. if not queryset.query.select_related: if self.list_select_related: queryset = queryset.select_related() elif self.list_select_related is None: related_fields = [] for field_name in self.list_display: try: