android - 预期为BEGIN_OBJECT，但在路径Moshi Json数据异常处为BEGIN_ARRAY

Question

我将Moshi用​​作Retrofit的转换器，但是对于一个特定的请求，它不起作用并且抛出了异常:

com.squareup.moshi.JsonDataException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at path $.animaux

这是杰森

    "nb_animaux": 1,    "animaux": [        {            "code_iso": "768010103010004",            "photos": [],            "espece": {                "id": 1,                "fr": "Bovin",                "en": "Bovine"            },            "elevage": {                "parametre_geographique": {                    "prefecture": "Oti",                    "region": "Savane",                    "commune": "Mango",                    "pays": {                        "fr": "TOGO",                        "en": "TOGO"                    },                    "village": "Fonboro"                },                "type_elevage": {},                "code_elevage": "76801010301"            },            "sexe": "m",            "date_naissance": 1561932000,            "category": {                "fr": "Taureau",                "en": "Bull"            },            "proprietaire": {                "id": 10,                "fullname": "edem",                "adresse": "lome",                "telephone": "98665478"            }        }    ],    "num_transport": "1/11/2019/TG",    "date_transport": 1574784132,    "traite": false}

My model class

@Entity
data class Animal(
    @field:PrimaryKey
    var id: Long,
    @ColumnInfo(name = "nb_animaux")
    @Json(name = "nb_animaux")
    var nbAnimaux : Int,
    @Embedded
    @get:Json(name = "animaux")
    var animaux : Animaux,
    @ColumnInfo(name = "num_transport")
    @Json(name = "num_transport")
    var numeroTransport : String,
    @ColumnInfo(name = "date_transport")
    @Json(name = "date_transport")
    var dateTransport : Long,
    var traite: Boolean

)
@JsonClass(generateAdapter = true)
data class Animaux(
    @ColumnInfo(name = "animaux_id")
    var id : Long,
    @ColumnInfo(name = "code_iso")
    @Json(name = "code_iso")
    var codeIso : Long,
    @Embedded
    var espece : Espece,
    @Embedded
    var elevage : Elevage,
    var sexe : String,
    @ColumnInfo(name = "date_naisance")
    @Json(name = "date_naisance")
    var dateNaissance : Long,
    @ColumnInfo(name = "race_pere")
    @Json(name = "race_pere")
    var racePere: String,
    @ColumnInfo(name = "race_mere")
    @Json(name = "race_mere")
    var raceMere: String,
    @Embedded
    var category: Category,
    @Embedded
    var proprietaire: Proprietaire

)
/*{
    constructor() : this(0, 0, Espece(0,"",""), Elevage(0, ParametreGeographique("","","",
        Country("",""),""
    ),0), "", 0, "", "", Category(0,"",""),Proprietaire
    (0,"","","",""))
}
 */
data class Espece(
    @ColumnInfo(name = "id_espece")
    @Json(name = "id_espece")
    var id: Long,
    var fr : String,
    var en : String
)
data class Elevage(
    @ColumnInfo(name = "id_elevage")
    @Json(name = "id_elevage")
    var id: Long,
    @Embedded
    var parametregeographique: ParametreGeographique,
    @ColumnInfo(name = "code_elevage")
    @Json(name = "code_elevage")
    var codeElevage : Long
)
data class ParametreGeographique(
    var prefecture : String,
    var region : String,
    var commune : String,
    @Embedded
    var pays : Country,
    var village : String
)
data class Country(
    @ColumnInfo(name = "fr_pays")
    @Json(name = "fr_pays")
    var fr : String,
    @ColumnInfo(name = "en_pays")
    @Json(name = "en_pays")
    var en : String
)

data class Category (
    @ColumnInfo(name = "id_category")
    var id: Long,
    @ColumnInfo(name = "fr_category")
    var fr : String,
    @ColumnInfo(name = "en_category")
    var en : String
)
data class Proprietaire(
    @ColumnInfo(name = "id_proprietaire")
    var id: Long,
    var fullname : String,
    var telephone : String,
    @ColumnInfo(name = "telephone_second")
    var telephoneSecond : String,
    @ColumnInfo(name = "photo_profile")
    var photoProfil : String
)

改造电话

@GET("marche-betail/transport/{id}")
fun commandesDetailFromServer(@Path("id") id: Long?): Observable<Animal>

我该如何处理错误。我尝试对 Animaux类使用构造函数，但出现错误。我也使用了 list<Animaux>，但是没有用。

Answer 1

您的JSON包含Animaux列表，而不仅仅是一个列表。因此，您需要var animaux: List[Animaux]，而不仅仅是Animaux。

How do you implement it in the model class. Could you show how to do it becuase when I try I get this error error: Entities and POJOs must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type). - java.util.List

房间 doesn't support such fields directly。从技术上讲，您可以使其工作(请参阅 Android room persistent library - how to insert class that has a List object field的答案)，但是您的数据绝对足够复杂，以至于我不会尝试将单个类用于JSON和Room。它最终会带有一个非常 un-normalized database。