reactor&feat: 重构工单模块 & 支持申请应用工单 (#5352)

* reactor: 修改工单Model，添加工单迁移文件

* reactor: 修改工单Model，添加工单迁移文件

* reactor: 重构工单模块

* reactor: 重构工单模块2

* reactor: 重构工单模块3

* reactor: 重构工单模块4

* reactor: 重构工单模块5

* reactor: 重构工单模块6

* reactor: 重构工单模块7

* reactor: 重构工单模块8

* reactor: 重构工单模块9

* reactor: 重构工单模块10

* reactor: 重构工单模块11

* reactor: 重构工单模块12

* reactor: 重构工单模块13

* reactor: 重构工单模块14

* reactor: 重构工单模块15

* reactor: 重构工单模块16

* reactor: 重构工单模块17

* reactor: 重构工单模块18

* reactor: 重构工单模块19

* reactor: 重构工单模块20

* reactor: 重构工单模块21

* reactor: 重构工单模块22

* reactor: 重构工单模块23

* reactor: 重构工单模块24

* reactor: 重构工单模块25

* reactor: 重构工单模块26

* reactor: 重构工单模块27

* reactor: 重构工单模块28

* reactor: 重构工单模块29

* reactor: 重构工单模块30

* reactor: 重构工单模块31

* reactor: 重构工单模块32

* reactor: 重构工单模块33

* reactor: 重构工单模块34

* reactor: 重构工单模块35

* reactor: 重构工单模块36

* reactor: 重构工单模块37

* reactor: 重构工单模块38

* reactor: 重构工单模块39

apps/tickets/serializers/comment.py

@@ -0,0 +1,29 @@
+from rest_framework import serializers
+from ..models import Comment
+from common.fields.serializer import ReadableHiddenField
+
+__all__ = ['CommentSerializer']
+
+
+class CurrentTicket(object):
+    ticket = None
+
+    def set_context(self, serializer_field):
+        self.ticket = serializer_field.context['ticket']
+
+    def __call__(self):
+        return self.ticket
+
+
+class CommentSerializer(serializers.ModelSerializer):
+    ticket = ReadableHiddenField(default=CurrentTicket())
+    user = ReadableHiddenField(default=serializers.CurrentUserDefault())
+
+    class Meta:
+        model = Comment
+        fields = [
+            'id', 'ticket', 'body', 'user', 'user_display', 'date_created', 'date_updated'
+        ]
+        read_only_fields = [
+            'user_display', 'date_created', 'date_updated'
+        ]