Django-Tastypie's data filtering and sorting tutorial

Django-Tastypie is a powerful API development framework that can quickly build RESTFUL API.When using TASTYPIE to develop API, data filtering and sorting are very important functions.This tutorial will introduce how data filtering and sorting in Django-Tastypie.At the same time, we will also explain related programming code and configuration. 1. Install django-tastypie First, make sure that you have installed Tastypie in your Django project.You can install it by running the following commands in the terminal: pip install django-tastypie 2. Create API resources In your Django project, you need to create an API resource to define the data you want to expose.Assuming we want to build an API for student information, we can create a resource in a new APP. First, run the following commands in your project directory to create a new app: python manage.py startapp api Next, create a new file in the API directory, named Resources.py.In this file, add the following code: python from tastypie.resources import ModelResource from api.models import Student class StudentResource(ModelResource): class Meta: queryset = Student.objects.all() resource_name = 'student' In the code, we created a Modelresource named StudentResource.We designate the model associated with this resource is Student and name the resource 'Student'. 3. Configure API URL To expose API resources to external applications, we need to add corresponding URLs to Django's URL configuration.In your project's urls.py file, add the following code: python from django.conf.urls import include, url from api.resources import StudentResource student_resource = StudentResource() urlpatterns = [ # Other URL configuration url(r'^api/', include(student_resource.urls)), ] In the code, we first introduced StudentResource and created a instance object Student_Resource.Then, we include student_resource.urls in the root of the API by using the include () function. 4. Data filter Now we have allocated API resources and URLs, and we can start achieving data filtering functions.In Tastypie, we can use the django_filters library to process the filter. First, create a new file in your API directory, named Filters.py.In this file, add the following code: python from django_filters import CharFilter from api.models import Student import django_filters class StudentFilter(django_filters.FilterSet): name = CharFilter(field_name='name', lookup_expr='icontains') class Meta: model = Student fields = ['name'] In the code, we created a Filterset called StudentFilter and defined a Charfilter named name.We use the lookup_expr parameter to specify the operator of the filter. Next, we need to apply this filter in StudentResource.Open the resources.py file and add the following code: python from api.filters import StudentFilter class StudentResource(ModelResource): # Other code class Meta: queryset = Student.objects.all() resource_name = 'student' filtering = { 'name': ('exact', 'startswith', 'contains', 'icontains'), } def apply_filters(self, request, applicable_filters): filters = {} for backend in self._meta.filter_backends: filters.update(backend().filter_queryset(request, self.get_object_list(request), applicable_filters)) return filters def get_object_list(self, request): return self.apply_filters(request, {}) def authorized_read_list(self, object_list, bundle): return object_list In the code, we first introduced StudentFilter and set the filter option of the 'name' field in the Filtering property in the Meta class.We also define two methods Apply_filters () and get_Object_list () for processing filtering. By configured the filter options and rewriting Apply_filters () and get_Object_list () methods, we can ensure that the filter will be applied to the query results. 5. Data sorting In Tastypie, data sorting is also a useful feature.We can be implemented by setting sorting fields in the Ordering properties of the META class. Open the resources.py file, add the following code to the meta class: python class StudentResource(ModelResource): # Other code class Meta: queryset = Student.objects.all() resource_name = 'student' filtering = { 'name': ('exact', 'startswith', 'contains', 'icontains'), } ordering = ['name'] In the code, we set the 'name' field in the Ordering property in the META class as the sorting field. Now, we have completed the configuration of data filtering and sorting.You can run your Django project and test them by accessing the corresponding API URL. This is a tutorial on realizing data filtering and sorting in Django-Tastypie.I hope this tutorial can help you understand and use the important feature of using Tastypie.If you encounter any problems, please refer to the official documentation or seek help in the community.