How to use Room Relation to get a list of another pojo

问题

@Entity(tableName = "subscription")
data class Subscription(
    @PrimaryKey val planId: Int,
    @ColumnInfo(name = "plan_name") val planName: String? = null,
    @ColumnInfo(name = "plan_description") val planDescription: String? = null,
    @ColumnInfo(name = "plan_reg_fee") val planRegFee: String? = null,
    @ColumnInfo(name = "plan_monthly_charge") val planMonthlyCharge: String? = null
)


data class Benefit(
    @ColumnInfo(name = "benefit_id") val benefitId: Int? = null,
    @ColumnInfo(name = "benefit_code") val benefitCode: Int? = null,
    @ColumnInfo(name = "benefit_name") val benefitName: String? = null,
    @ColumnInfo(name = "benefit_status") val benefitStatus: String? = null
)

how to get a list of Benefit inside Subscription i.e.,

val benefitList: LiveData<List<Benefit>>? = null

using Room relation

回答1:

You can find examples from Google Documents. There are examples about Relation in Room.

来源：https://stackoverflow.com/questions/53183770/how-to-use-room-relation-to-get-a-list-of-another-pojo