[英]How to serialize multiple models data in django-rest when models classes are generated from legacy database
Model classes are generated from existing database, do not show foreign keys relation in generated model classes. 模型类是从现有数据库生成的,在生成的模型类中不显示外键关系。
$ python manage.py inspectdb $ python manage.py inspectdb > models.py
Goal is to get related data from multiple tables. 目标是从多个表中获取相关数据。
Following is my serializer snippet: 以下是我的序列化器代码段:
from .models import JobsList, JobsCategories class JobsCategoriesSerializer(serializers.ModelSerializer): class Meta: model = JobsCategories fields = ('name', 'id',) class JobsListSerializer(serializers.ModelSerializer): category = JobsCategoriesSerializer(source='job_category', many=True) class Meta: model = JobsList fields = ('job_title', 'category')
Error: Request Method: GET Request URL: http://localhost:8000/jobs/6 /?access_token=bBN6BSLlYi8TXF3SkLEOMbtsKfD3xX&format=json Django Version: 1.8.3 Exception Type: TypeError Exception Value: 错误:请求方法:GET请求URL: http:// localhost:8000 / jobs / 6 /?access_token = bBN6BSLlYi8TXF3SkLEOMbtsKfD3xX&format = json Django版本:1.8.3异常类型:TypeError异常值:
'long' object is not iterable “长”对象不可迭代
5.1 The response is: 5.1响应为:
{"id":6,"userid":491,"company_id":4,"job_title":"Web Designer","job_info":"We require a web designer.","min_exp":0,"max_exp":1,"min_ctc":null,"max_ctc":null,"open_positions":0,"location":"18","hr_email":"","contact_number":"","job_category":3,"job_referred":"0","added_by":"0","status":"1","date_time":null,"expiry_date":null,"job_meta":"web graphics bodhan designer funvestfinancials","job_type":"0"}
** I want job_category which is an id replaced with category name** **我想要job_category,它是一个ID替换为类别名称**
I need help to get category name with job data jobs_category and jobs_list are two separate model classes generated by reverse engineering from existing database. 我需要帮助以获取具有作业数据的类别名称Jobs_category和Jobs_list是通过逆向工程从现有数据库生成的两个单独的模型类。 Kindly help me if this is possible in this way I am doing or if it is doable in another. 如果可以通过这种方式实现,或者可以在另一种方式实现,请为我提供帮助。
Job list model: 作业列表模型:
class JobsList(models.Model): ..... job_category = models.IntegerField(blank=True, null=True) .....
Category model: 类别模型:
class JobsCategories(models.Model): name = models.CharField(max_length=255) status = models.CharField(max_length=1) class Meta: managed = False db_table = 'jobs_categories' def __unicode__(self): return '%s' % (self.name)
** I need categories name whose id is in job_category column jobs_list table. **我需要类别名称,其ID在job_category列jobs_list表中。 Issue is the model classes generated from legacy database do not have relations ** 问题是从旧版数据库生成的模型类没有关系**
You can override the to_representation()
method of the JobsListSerializer
to get your desired response. 您可以覆盖to_representation()
的方法JobsListSerializer
得到您所期望的响应。
You need to do something like: 您需要执行以下操作:
class JobsListSerializer(serializers.ModelSerializer):
class Meta:
model = JobsList
...
def to_representation(self, obj):
serialized_data = super(JobsListSerializer, self).to_representation(obj) # original serialized data
job_category_id = serialized_data.get('job_category') # get job category id from original serialized data
job_category = JobsCategories.objects.get(id=job_category_id) # get the object from db
serialized_data['job_category'] = job_category.name # replace id with category name
return serialized_data # return modified serialized data
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