[英]Django rest framework serializer with field from related table
我有以下型號:
class Workflow(models.Model):
name = models.CharField(max_length=200)
class Task(models.Model):
name = models.CharField(max_length=200)
class TaskParameter(models.Model):
default_value = models.CharField(max_length=1000, null=True)
name = models.CharField(max_length=200)
task = models.ForeignKey(Task, related_name='parameters', on_delete=models.CASCADE, null=True)
class WorkflowTask(models.Model):
task = models.ForeignKey(Task, on_delete=models.CASCADE)
workflow = models.ForeignKey(Workflow, related_name='workflow_tasks', on_delete=models.CASCADE, null=True)
class WorkflowTaskParameter(models.Model):
value = models.CharField(max_length=1000)
workflow_task = models.ForeignKey(WorkflowTask, on_delete=models.CASCADE, related_name='workflow_task_parameters', null=True)
task_parameter = models.ForeignKey(TaskParameter, on_delete=models.CASCADE, related_name='+')
因此,基本上我想做的是讓工作流包含任務(使用WorkflowTask
關聯表),並且這些任務具有參數( TaskParameter
)。 這些參數有一個默認值,但我希望能夠用另一個值覆蓋此默認值(這是WorkflowTaskParameter
表的用途)。
這是我的序列化器:
class TaskParameterSerializer(serializers.ModelSerializer):
class Meta:
model = TaskParameter
fields = ('name', 'default_value')
class WorkflowTaskParameterSerializer(serializers.ModelSerializer):
name = serializers.StringRelatedField(many=False) # here i want the name from the associated TaskParameter
class Meta:
model = WorkflowTaskParameter
fields = ('name', 'value')
class WorkflowTaskSerializer(serializers.ModelSerializer):
task = serializers.StringRelatedField(many=False)
workflow_task_parameters = WorkflowTaskParameterSerializer(many=True, read_only=True)
class Meta:
model = WorkflowTask
fields = ('task', 'workflow_task_parameters')
class WorkflowSerializer(serializers.ModelSerializer):
workflow_tasks = WorkflowTaskSerializer(many=True, read_only=True)
class Meta:
model = Workflow
fields = ('name', 'workflow_tasks')
我快要得到想要的結果了:
{
"name": "MyWorkflow",
"workflow_tasks": [
{
"task": "MyTask",
"workflow_task_parameters": [
{
// missing the task parameter name here
"value": "myoverridedvalue"
}
]
}
]
}
正如評論中提到的,即使我在WorkflowTaskParameterSerializer
放置了一個“名稱” StringRelatedfield
,為什么任務參數名稱也沒有出現在結果中? 這是設計問題嗎?
更改為
name = serializers.CharField(source='task_parameter.name')
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