gson未将值与kotlin中的数据类映射

嗨,我在用 gson 将响应值映射到模型的库。我是这样做的,但它不是将响应值映射到模型。我得到了50个模型的列表,但其中的值为零。

@Provides
@Singleton
fun provideRestApiHelper(
        okHttpClient: OkHttpClient,
        gson: Gson,
        rxJava2CallAdapterFactory: RxJava2CallAdapterFactory): RestApi {
    val builder = Retrofit.Builder()
            .baseUrl(BuildConfig.BASE_URL)
            .addCallAdapterFactory(rxJava2CallAdapterFactory)
            .addConverterFactory(GsonConverterFactory.create(gson))
    val retrofit = builder.client(okHttpClient).build()
    return retrofit.create(RestApi::class.java)
}

雷斯塔皮

interface RestApi {

    @GET(ApiEndPoint.ENDPOINT_GITHUB_JOBS)
    fun getJobsApiCall(): Observable<List<JobsResponse>>
}

ApihelperImpl.kt公司

class ApiHelperImpl @Inject constructor(private val restApi: RestApi) : ApiHelper {

    override fun getJobsApiCall(): Observable<List<JobsResponse>> {
        return restApi.getJobsApiCall()
    }
}

工作响应.kt

data class JobsResponse(

        @field:SerializedName("company_logo")
        val companyLogo: String?,

        @field:SerializedName("how_to_apply")
        val howToApply: String?,

        @field:SerializedName("created_at")
        val createdAt: String?,

        @field:SerializedName("description")
        val description: String?,

        @field:SerializedName("location")
        val location: String?,

        @field:SerializedName("company")
        val company: String?,

        @field:SerializedName("company_url")
        val companyUrl: String?,

        @field:SerializedName("id")
        val id: String?,

        @field:SerializedName("title")
        val title: String?,

        @field:SerializedName("type")
        val type: String?,

        @field:SerializedName("url")
        val url: String?
) : BaseResponse()

我正在调用这个api https://jobs.github.com/positions.json . 有人知道会有什么问题吗?