Django prefetch_relatedを取得するにはどうすればいいですか？

Question

モデル番号LanguageCodeとFlagの間に1対多の関係があるため、Django prefetch_relatedを使用しようとしています（flagIconPathを表示しようとしていますが）views.pyコードが正しく表示されない場合があります。 ！

from django.shortcuts import render 

from app_data.models import RIAchievement 

def ri_achievements(request): 

    qs = RIAchievement.objects.all().prefetch_related("??????", "????????") 

    return render(request, 'index.html',{'qs': qs}) 

私は???さんを置き換えるためにどのようなコードを使用してする必要があります。ここでは

は私views.py形ですか？

は、ここで私はDjangoは表示にprefetch_related取得しようとしていますフィールドです：

class RIAchievement(models.Model): 
    riAchievementID = models.AutoField(primary_key=True, db_column="riAchievementID") 
    userLanguageVersionID = models.ForeignKey(UserLanguageVersion, db_column="userLanguageVersionID", related_name="riAchievement_userLanguageVersionID") 
    typeAchievementID = models.ForeignKey(TypeAchievement, db_column="typeAchievementID", related_name="riAchievement_typeAchievementID") 
    riAchievementTypeUserDescription = models.CharField(max_length=255, blank=True, null=True, db_column="riAchievementTypeUserDescription") 
    riAchievementDescription = models.TextField(max_length=2000, db_column="riAchievementDescription") 
    auth_user_id = models.ForeignKey(auth_user, db_column="auth_user_id", related_name="riAchievement_auth_user_id") 
    class Meta: 
    db_table="riAchievement" 

class TypeAchievement(models.Model): 
    typeAchievementID = models.AutoField(primary_key=True, db_column="typeAchievementID") 
    languageCodeID = models.ForeignKey(LanguageCode, db_column="languageCodeID", related_name="typeAchievement_languageCodeID") 
    typeAchievementDescriptionIntl = models.CharField(max_length=255, db_column="typeAchievementDescriptionIntl") 
    typeAchievementDescriptionEng = models.CharField(max_length=255, db_column="typeAchievementDescriptionEng") 
    typeAchievementAltID = models.IntegerField(db_column="typeAchievementAltID") 
    class Meta: 
    db_table="typeAchievement" 

class UserLanguageVersion(models.Model): 
    userLanguageVersionID = models.AutoField(primary_key=True, db_column="userLanguageVersionID") 
    auth_user_id = models.ForeignKey(auth_user, db_column="auth_user_id", related_name="userLanguageVersion_auth_user_id") 
    languageCodeID = models.ForeignKey(LanguageCode, db_column="languageCodeID", related_name="userLanguageVersion_languageCodeID") 
    class Meta: 
    db_table="userLanguageVersion" 

class LanguageCode(models.Model): 
    languagecodeID = models.AutoField(primary_key=True, db_column="languageCodeID") 
    languageCodeDescription = models.CharField(max_length=10, db_column="languageCodeDescription") 
    baseLanguageCode = models.CharField(max_length=10, db_column="baseLanguageCode") 
    languageNameEng = models.CharField(max_length=255, db_column="languageNameEng") 
    altLanguageNameEng = models.CharField(max_length=255, blank=True, null=True, db_column="altLanguageNameEng") 
    languageNameNative = models.CharField(max_length=255, db_column="languageNameNative") 
    altLanguageNameNative = models.CharField(max_length=255, blank=True, null=True, db_column="altLanguageNameNative") 
    iso639_1 = models.CharField(max_length=10, blank=True, null=True, db_column="iso639_1") 
    iso639_2T = models.CharField(max_length=10, db_column="iso639_2T") 
    iso639_2B = models.CharField(max_length=10, db_column="iso639_2B") 
    iso639_X = models.CharField(max_length=10, db_column="iso639_X") 
    languageDirectionID = models.ForeignKey(LanguageDirection, default=1, db_column="languageDirectionID", related_name="languageCode_languageDirectionID") 
    class Meta: 
    db_table="languageCode" 

class Flag(models.Model): 
    flagID = models.AutoField(primary_key=True, db_column="flagID") 
    languageCodeID = models.ForeignKey(LanguageCode, db_column="languageCodeID", related_name="flag_languageCodeID") 
    flagIconPath = models.CharField(max_length=255, db_column="flagIconPath") 
    flagDescription = models.CharField(max_length=255, db_column="flagDescription") 
    flagInformation = models.CharField(max_length=255, db_column="flagInformation") 
    class Meta: 
    db_table="flag" 

class auth_user(models.Model): 
    auth_user_id = models.AutoField(primary_key=True, db_column="id") 
    username = models.CharField(max_length=30, unique=True, db_column="username") 
    first_name = models.CharField(max_length=30, db_column="first_name") 
    last_name = models.CharField(max_length=30, db_column="last_name") 
    email = models.CharField(max_length=75, db_column="email") 
    password = models.CharField(max_length=128, db_column="password") 
    is_staff = models.BooleanField(db_column="is_staff") 
    is_active = models.BooleanField(db_column="is_active") 
    is_supervisor = models.BooleanField(db_column="is_supervisor") 
    last_login = models.DateTimeField(db_column="last_login") 
    date_joined = models.DateTimeField(db_column="date_joined") 
    class Meta: 
    db_table="auth_user" 

class RIUserSettings(models.Model): 
    riUserSettingsID = models.AutoField(primary_key=True, unique=True, db_column="riUserSettingsID") 
    riUserSettingsPrimaryLanguageCodeID = models.ForeignKey(LanguageCode, db_column="riUserSettingsPrimaryLanguageCodeID", related_name="riUserSettings_riUserSettingsPrimaryLanguageCodeID") 
    riUserSettingsDisplayPrimaryLanguage = models.BooleanField(default=False, db_column="riUserSettingsDisplayPrimaryLanguage") 
    riUserSettingsDisplayMutipleLanguage = models.BooleanField(default=False, db_column="riUserSettingsDisplayMutipleLanguage") 
    riUserSettingsDisplaySingleLanguage = models.BooleanField(default=False, db_column="riUserSettingsDisplaySingleLanguage") 
    riUserSettingsPrimaryVirtualKeyboardLanguageVersionID = models.ForeignKey(UserLanguageVersion, db_column="riUserSettingsPrimaryVirtualKeyboardLanguageVersionID", related_name="riUserSettings_riUserSettingsPrimaryVirtualKeyboardLanguageVersionID") 
    riUserSettingsDisplayPrimaryVirtualKeyboard = models.BooleanField(default=False, db_column="riUserSettingsDisplayPrimaryVirtualKeyboard") 
    riUserSettingsDisplayRIFormattingPreview = models.BooleanField(default=True, db_column="riUserSettingsDisplayRIFormattingPreview") 
    typeResumeStyleID = models.ForeignKey(TypeResumeStyle, db_column="typeResumeStyleID", related_name="riUserSettings_typeResumeStyleID") 
    auth_user_id = models.ForeignKey(auth_user, db_column="auth_user_id", related_name="riUserSettings_auth_user_id") 
    class Meta: 
    db_table="riUserSettings" 

class LanguageDetail(models.Model): 
    languageDetailID = models.AutoField(primary_key=True, unique=True, db_column="languageDetailID") 
    languageCodeID = models.ForeignKey(LanguageCode, db_column="languageCodeID", related_name="languageDetail_languageCodeID") 
    nativeLanguageCodeID = models.ForeignKey(LanguageCode, db_column="nativeLanguageCodeID", related_name="languageDetail_nativeLanguageCodeID") 
    languageDetailDescriptionIntl = models.CharField(max_length=255, db_column="languageDetailDescriptionIntl") 
    languageDetailDescriptionEng = models.CharField(max_length=255, db_column="languageDetailDescriptionEng") 
    languageDetailDescriptionNative = models.CharField(max_length=255, db_column="languageDetailDescriptionNative") 
    displayCapitaliseCountryName = models.BooleanField(default=False, db_column="displayCapitaliseCountryName") 
    languageDirectionID = models.ForeignKey(LanguageDirection, default=1, db_column="languageDirectionID", related_name="languageDetail_languageDirectionID") 
    flagID = models.ForeignKey(Flag, db_column="flagID", related_name="languageDetail_FlagID") 
    languageDetailAltID = models.IntegerField(db_column="languageDetailAltID") 
    class Meta: 
    db_table="languageDetail" 

class LanguageDirection(models.Model): 
    languageDirectionID = models.AutoField(primary_key=True, db_column="languageDirectionID") 
    languageDirectionDescription = models.CharField(max_length=20, db_column="languageDirectionDescription") 
    languageDirDescription = models.CharField(max_length=20, db_column="languageDirDescription") 
    textAlign = models.CharField(max_length=20, db_column="textAlign") 
    oppositeLanguageDirectionDescription = models.CharField(max_length=20, db_column="oppositeLanguageDirectionDescription") 
    oppositeLanguageDirDescription = models.CharField(max_length=20, db_column="oppositeLanguageDirDescription") 
    oppositeTextAlign = models.CharField(max_length=20, db_column="oppositeTextAlign") 
    class Meta: 
    db_table="languageDirection" 

class TypeResumeStyle(models.Model): 
    typeResumeStyleID = models.AutoField(primary_key=True, db_column="typeResumeStyleID") 
    languageCodeID = models.ForeignKey(LanguageCode, db_column="languageCodeID", related_name="typeResumeStyle_languageCodeID") 
    typeResumeStyleNumber = models.IntegerField(db_column="typeResumeStyleNumber") 
    typeResumeStyleNameIntl = models.CharField(max_length=255, db_column="typeResumeStyleNameIntl") 
    typeResumeStyleNameEng = models.CharField(max_length=255, db_column="typeResumeStyleNameEng") 
    typeResumeStyleDescriptionIntl = models.CharField(max_length=255, db_column="typeResumeStyleDescriptionIntl") 
    typeResumeStyleDescriptionEng = models.CharField(max_length=255, db_column="typeResumeStyleDescriptionEng") 
    class Meta: 
    db_table="typeResumeStyle" 

Answer 1

Aagh、私の目：

(flag) flagiconpath, 
(riachievement) riAchievementTypeUserDescription, 
(typeachievement) typeAchievementDescriptionIntl, 
(languagecode) languageNameNative, 
(flag) flagIconPath, 
(languagedetail) languageDetailDescription, 
(languagedirection) languageDirectionDescription, 
(riusersettings) riUserSettingsDisplayMultipleLanguage, 
(typeresumestyle) typeResumeStyleNumber, 
(auth_user) id. 

はここに私の関連するモデルです。あなたのフィールドにPythonicの名前を適切に付けてください。すでに db_column属性を使用している、特に以来、あなたはそれがあるとして、あなたのDBを維持し、あなたのフィールドに私たちが実際に読むことができる名前を付けることができます。特に

、あなたのForeignKeyのフィールドはfooIdと呼ばれるべきではありません。基礎となるデータベースのフィールドがIDですが、フィールドではありません、それは実際のFKモデルへの参照です。

かかわらず、あなたの質問に答えるために、あなたが言及するすべてのFKSは前方参照、後方ではないです。だから、ここでは、ないprefetch_relatedselect_relatedを、使用する必要があります。