implementing Saving Complex Objects in Room Database Using TypeConverters on Android 13
I'm trying to debug Does anyone know how to I'm sure I'm missing something obvious here, but I'm working with a question when trying to save a complex object in a Room database on Android 13 using TypeConverters... I have a data class that contains a list of another data class, and I want to store it in the database. Here’s the data model I’m working with: ```kotlin @Entity(tableName = "user_table") data class User( @PrimaryKey val id: Int, val name: String, val preferences: List<Preference> ) data class Preference( val key: String, val value: String ) ``` To handle the list of `Preference` objects, I created a TypeConverter as follows: ```kotlin class Converters { @TypeConverter fun fromPreferenceList(preferences: List<Preference>): String { val gson = Gson() return gson.toJson(preferences) } @TypeConverter fun toPreferenceList(data: String): List<Preference> { val gson = Gson() val listType = object : TypeToken<List<Preference>>() {}.type return gson.fromJson(data, listType) } } ``` I registered this converter in my Room database class: ```kotlin @Database(entities = [User::class], version = 1) @TypeConverters(Converters::class) abstract class UserDatabase : RoomDatabase() { abstract fun userDao(): UserDao } ``` However, when I attempt to insert a `User` object into the database, I receive the following behavior: ``` androidx.room.util.TableInfo$MismatchException: Expected: TableInfo{name='user_table', columns={preferences=Column{name='preferences', type='TEXT', affinity='2', notNull=false, primaryKey=false, autoIncrement=false}}, foreignKeys=[]} Found: TableInfo{name='user_table', columns={preferences=Column{name='preferences', type='BLOB', affinity='0', notNull=false, primaryKey=false, autoIncrement=false}}, foreignKeys=[]} ``` It seems that the data type for the `preferences` column is being inferred as `BLOB` instead of `TEXT`. I’ve tried cleaning and rebuilding my project, but the scenario continues. What could be the reason behind this type mismatch, and how can I ensure the `preferences` field is saved as `TEXT` in the database? Any guidance would be greatly appreciated! Any ideas what could be causing this? This is part of a larger application I'm building. Thanks for any help you can provide!