Resolve "[Lesson substitution] View with all lesson substitutions in the future"

Closes #11 (closed)

biscuit/apps/chronos/tables.py

@@ -37,12 +37,9 @@ class SubstitutionsTable(tables.Table):
     class Meta:
         attrs = {'class': 'table table-striped table-bordered table-hover table-responsive-xl'}
 
-    lesson__date_start = tables.Column(accessor='lesson.date_start')
-    lesson__date_end = tables.Column(accessor='lesson.date_end')
-    period__period = tables.Column(accessor='period.period')
-    lesson__groups = tables.Column(accessor='lesson.group_names', verbose_name=_('Groups'))
-    lesson__teachers = tables.Column(accessor='lesson.teacher_names', verbose_name=_('Teachers'))
-    lesson__subject = tables.Column(accessor='lesson.subject')
-    room = tables.Column(accessor='room')
-    edit_substitution = tables.LinkColumn(
-        'edit_substitution', args=[A('id'), A('_week')], text=_('Substitution'))
+    lesson__date_start = tables.Column(accessor='lesson_period.lesson.date_start')
+    lesson__date_end = tables.Column(accessor='lesson_period.lesson.date_end')
+    lesson__groups = tables.Column(accessor='lesson_period.lesson.group_names', verbose_name=_('Groups'))
+    lesson__teachers = tables.Column(accessor='lesson_period.get_teacher_names', verbose_name=_('Teachers'))
+    lesson__subject = tables.Column(accessor='lesson.')
+    room = tables.Column(accessor='lesson_period.room')