This article walks you through the steps of a beginner developing a coupon distribution service for the iPhone with a RESTful API and swift. It is a very detour implementation because it was implemented while examining the technical elements one by one.
Matches the parameters of a field specified using Generic Filtering in the previous Django Rest Framework to set a filter to respond only to specific data (https://qiita.com/Ajyarimochi/items/7e22de20292ca57ea8dc). I was able to filter the data. However, with this method, it is not possible to filter the specified parameters under the conditions of "greater than or equal to" and "less than or equal to".
Therefore, this time, we will implement a filter function that determines the expiration date based on conditions such as "before" and "after" for the date.
If you haven't installed Django-Filter, please install it by referring to Previous article.
Mac OS 10.15 VSCode 1.39.2 pipenv 2018.11.26 Python 3.7.4 Django 2.2.6
Create an original filter set by inheriting the FilterSet class of django_filter. First, add a process to import the FilterSet class.
from django_filters import rest_framework as filters
Then implement the original filter set before the ViewSet class.
class CustomFilter(filters.FilterSet):
#Filter definition
deadline = filters.DateFilter(field_name='deadline', lookup_expr='gte')
class Meta:
model = Coupon
fields = ['deadline'] #Enumerate defined filters
The following part is the filter setting. This time I will use DateFilter, but there are many other filters such as string filters and numerical filters. See Official Documentation for more information!
deadline = filters.DateFilter(field_name='deadline', lookup_expr='gte')
** Supplement **
The above field_name = ‘’ specifies the name of the model field you want to filter. If you do not specify a name here, the name of the filter definition (deadline part in the above code) will be treated as the name of the model field to be filtered.
(Field_name is specified in the sample code, but it is not actually necessary if it is the same as the name of the filter definition.)
The parameter name when making a request will be the name of the filter definition. In other words, ** if you want the parameter name to be different from the model field name when requesting, you need to set field_name **.
Set the model name of the filtered data in model = ~ below.
Fields = [～] lists the names of the filter definitions.
class Meta:
model = Coupon
fields = ['deadline']
Just call the filter class implemented above as filter_class.
filter_class = CustomFilter
Estimated 5 minutes → 5 minutes
Compares the difference in the data that can be obtained when and when deadline, which indicates the expiration date of the coupon, is not specified as the request parameter.
** If the parameter deadline is not specified **
request
curl -X GET http://127.0.0.1:8000/api/coupons/
response
[{"id": 1, "code": "0001", "benefit": "1,000 yen discount from payment", "explanation": "Limited to customers using 5,000 yen or more. Cannot be used with other coupons. "," store ":" All stores "," start ":" 2019-10-01 "," deadline ":" 2019-12-31 "," status ": true}, {" id ": 2," code ":" 0002 "," benefit ":" 10% off payment! "," explanation ":" Cannot be combined with other coupons "," store ":" Yurakucho store "," start ":" 2019-10 -01 "," deadline ":" 2019-12-31 "," status ": true}, {"id ": 3," code ":" 0003 "," benefit ":" [Halloween only] Disguise 30% off when you come to the store "," explanation ":" Only for customers who are disguised as 50% or more of the whole body (judgment is the feeling of the staff). Cannot be used with other coupons "," store ":" Kanda store "," start ":" 2019-10-31 "," deadline ":" 2019-10-31 "," status ": true}, {"id ": 4," code ":" 0004 ", "benefit": "[September only] Moon-viewing dumpling service", "explanation": "Given a moon-viewing dumpling to customers who wish! Can be used with other coupons!", "Store": "All stores" , "start": "2019-09-01", "deadline": "2019-09-30", "status": true}, {"id": 5, "code": "0005", "benefit" : "[Rainy days only] 15% off payment", "explanation": "Available only when coupons are delivered. Cannot be combined with other coupons", "store": "All stores", "start" ":" 2019-10-01 "," deadline ":" 2019-12-31 "," status ": false}, {" id ": 6," code ":" 0006 "," benefit ":" [ Sunday only] Cheers Tequila Service "," explanation ":" We will serve Tequila for the number of people. Can be used with other coupons. "," store ":" Kanda Store "," start ":" 2019-11-03 " , "d eadline ":" 2019-12-01 "," status ": true}, {"id ": 7," code ":" 0007 "," benefit ":" 19% discount from your bill "," explanation ": "Limited to December 29th-December 31st. Cannot be used with other coupons "," store ":" Kanda store "," start ":" 2019-12-29 "," deadline ":" 2019-12-31 "," status ": true}]
** When specifying deadline **
Request (Request only coupons with expiration date after December 5th)
curl -X GET http://127.0.0.1:8000/api/coupons/?deadline=2019-12-05
response
[{"id": 1, "code": "0001", "benefit": "1,000 yen discount from payment", "explanation": "Only for customers using 5,000 yen or more. Cannot be used with other coupons. "," store ":" All stores "," start ":" 2019-10-01 "," deadline ":" 2019-12-31 "," status ": true}, {" id ": 2," code ":" 0002 "," benefit ":" 10% off your bill! "," explanation ":" Cannot be combined with other coupons "," store ":" Yurakucho store "," start ":" 2019-10 -01 "," deadline ":" 2019-12-31 "," status ": true}, {"id ": 5," code ":" 0005 "," benefit ":" [Rainy days only] 15% off from checkout "," explanation ":" Only available when coupons are delivered. Cannot be combined with other coupons "," store ":" All stores "," start ":" 2019-10-01 " , "deadline": "2019-12-31", "status": false}, {"id": 7, "code": "0007", "benefit": "19% discount from checkout", "explanation" ":" Limited to December 29th-December 31st. Cannot be used with other coupons "," store ":" Kanda store "," start ":" 2019-12-29 "," deadline ":" 2019 -12-31 "," status ": true}]
I was able to get only coupons that are valid after December 5th.
Next, Implement authentication function
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