𝐓𝐨𝐝𝐚𝐲 𝐈 𝐋𝐞𝐚𝐫𝐧 2022.04.22.금

오늘은 M:N을 이용하고 REST API를 활용한 페이지 구현을 하였다.

사실 M:N의 개념이 아직 명확하게 정립되지 않아서 models.py와 serializers.py를 작성하는데 힘들었다.

또한,

python manage.py loaddata movies/actors.json movies/movies.json movies/reviews.json

할 때 계속 오류가 났다. 그래서 models.py 부분을 다음과 같이 수정했다.

from django.db import models

# Create your models here.
class Actor(models.Model):
    name = models.CharField(max_length=100)
class Movie(models.Model):
    title = models.CharField(max_length=100)
    overview = models.TextField()
    release_date = models.DateTimeField()
    poster_path = models.TextField()
    actors = models.ManyToManyField(Actor,related_name='actors')



class Review(models.Model):
    title = models.CharField(max_length=100) 
    content = models.TextField()
    movie = models.ForeignKey(Movie,on_delete=models.CASCADE)

위의 오류를 고치고 admin을 등록하려고 하니 또 한 번 오류를 만났다. 
모델에 있는 여러가지 것들을 call해올 수 없다는 오류를 만났다. 
처음에는 다음과 같이 코드를 적었었다.

from django.db import models
# Create your models here.

class Actor(models.Model):
    name = models.CharField(max_length=100)
class Movie(models.Model):
    title = models.CharField(max_length=100)
    overview = models.TextField()
    release_date = models.DateTimeField()
    poster_path = models.TextField()
    actors = models.ManyToManyField(Actor,related_name='movies')



class Review(models.Model):
    title = models.CharField(max_length=100) 
    content = models.TextField()
    movie = models.ForeignKey(Movie,on_delete=models.CASCADE)

그래서 이 구문이 잘못 되었음을 인지했다. 
어차피 모델을 다 불러올거니까 model등록을 다 하면 된다는 생각이 들어 다음과 같이 바꾸니 서버도 제대로 켜지고 admin 사이트도 제대로 되었다.

from django.contrib import admin
from .models import Movie,Actor,Review

# Register your models here

admin.site.register(Actor)
admin.site.register(Movie)
admin.site.register(Review)

그래서 이 구문이 잘못 되었음을 인지했다. 
어차피 모델을 다 불러올거니까 model등록을 다 하면 된다는 생각이 들어 다음과 같이 바꾸니 서버도 제대로 켜지고 admin 사이트도 제대로 되었다.
그리고 detail페이지에서 영화 배우를 누르면 그 영화배우의 영화목록이 나와야하는데 잘 나오지 않아서 매우 힘들었다. 
serializers.py를 다음과 같이 적어 해결하였다. 
class를 따로 만들어 내가 불러오고자 한거를 다시 불러오는 방법이다.

from rest_framework import serializers
from .models import *

class ActorListSerializer(serializers.ModelSerializer):
    class Meta:
        model = Actor
        fields = ('id' , 'name')

class MovieListSerializer(serializers.ModelSerializer):
    class Meta:
        model = Movie
        fields = ('title','overview')



class ActorSerializer(serializers.ModelSerializer):
    movies = MovieListSerializer(many = True, read_only = True)
    
    class Meta:
        model = Actor
        fields = ('id','movies','name')


class MovieSerializer_actor(serializers.ModelSerializer):
    class Meta:
        model = Actor
        fields = ('name',)

class MovieSerializer(serializers.ModelSerializer):

    actors = MovieSerializer_actor(many = True, read_only = True)
    class Meta:
        model = Movie
        fields = '__all__'


class ReviewListSerializer(serializers.ModelSerializer):
    class Meta:
        model = Review
        fields = ('title','content')


class ReviewSerializer_movie(serializers.ModelSerializer):
    class Meta:
        model = Movie
        fields = ('title',)


class ReviewSerializer(serializers.ModelSerializer):
    movie = ReviewSerializer_movie(read_only=True)
    class Meta:
        model = Review
        fields = '__all__'

이전에는 Django REST Framework의 1:N 관계까지배웠다면 오늘은 M:N 관계를 이용해서 Manytofield를 사용해 주었다. 
아직 이 부분은 나에게 좀 어려운 거 같아 주말 동안 공부를 더 해봐야겠다. 그리고 변수명을 잘 적어주어야겠다.... 
pk를 불러올 때 `s`하나 빼먹어서 오류 창이 계속 만났다. 
오늘 과정 하나하나마다 오류 창을만났는데 아직도 오류 창이 크게 반갑지는 않지만 오류를 하나씩 해결해 나갈 때마다 뿌듯함이 느껴진다.

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