I am pulling a word json file data from my asset file. then I try to save these data in my room database. I 'm gonna read these data from room after I save. this is my plan but I have a error.
I will share my error and codes below
This json file looks like this
My word json file in asset folder
[
{
"words": [
{
"word": "the",
"meaning": " “The sky is blue.” "
},
{
"word": "be",
"meaning": "be – “Will you be my friend?”"
},
{
"word": "and",
"meaning": "and – “You and I will always be friends.”"
},
{
"word": "of",
"meaning": "of – “Today is the first of November.”"
},
ERROR
and I get the following error while processing it.
kotlinx.serialization.MissingFieldException: Field 'words' is required for type with serial name 'com.enestigli.dictionaryapp.data.locale.datamodel.WordsItem', but it was missing
at kotlinx.serialization.internal.PluginExceptionsKt.throwMissingFieldException(PluginExceptions.kt:20)
at com.enestigli.dictionaryapp.data.locale.datamodel.WordsItem.<init>(Word.kt:19)
at com.enestigli.dictionaryapp.data.locale.datamodel.WordsItem$$serializer.deserialize(Word.kt:19)
at com.enestigli.dictionaryapp.data.locale.datamodel.WordsItem$$serializer.deserialize(Word.kt:19)
at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
at kotlinx.serialization.encoding.CompositeDecoder$DefaultImpls.decodeSerializableElement$default(Decoding.kt:535)
at kotlinx.serialization.internal.ListLikeSerializer.readElement(CollectionSerializers.kt:80)
at kotlinx.serialization.internal.AbstractCollectionSerializer.readElement$default(CollectionSerializers.kt:51)
at kotlinx.serialization.internal.AbstractCollectionSerializer.merge(CollectionSerializers.kt:36)
at kotlinx.serialization.internal.AbstractCollectionSerializer.deserialize(CollectionSerializers.kt:43)
at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
at com.enestigli.dictionaryapp.data.locale.datamodel.WordDataModel$$serializer.deserialize-hOmtatA(Word.kt:11)
at com.enestigli.dictionaryapp.data.locale.datamodel.WordDataModel$$serializer.deserialize(Word.kt:11)
at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
at kotlinx.serialization.json.Json.decodeFromString(Json.kt:100)
at com.enestigli.dictionaryapp.data.locale.datasource.AssetDataSource.getCommonWords-hOmtatA(AssetsDataSource.kt:109)
at com.enestigli.dictionaryapp.data.repository.WordRepositoryImpl.initData(WordRepositoryImpl.kt:24)
at com.enestigli.dictionaryapp.domain.use_case.commonword.insert.InsertCommonWordUseCase.insertCommonWord(InsertCommonWordUseCase.kt:13)
at com.enestigli.dictionaryapp.presentation.SplashScreen.SplashScreenViewModel$insertAllDataToRoomDb$1.invokeSuspend(SplashScreenViewModel.kt:41)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7898)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@c7efc65, Dispatchers.Main.immediate]
my data model for word
@JvmInline
@Serializable
value class WordDataModel(
val allData : List<WordsItem>
)
@Serializable
data class WordsItem(
val words: List<CommonWords>
) {
fun toEntity() = CommonWordEntity(
words = words
)
}
@Serializable
data class CommonWords(
val word:String,
val meaning:String
)
Room
Entity
@Entity(tableName = "MostCommonWords")
data class CommonWordEntity(
@ColumnInfo(name = "commonWord") val words : List<CommonWords>,
@PrimaryKey(autoGenerate = true) val uid : Int? = null
)
Dao
@Dao
interface CommonWordDao {
@Query("SELECT * FROM MostCommonWords")
suspend fun getAllWords() : List<CommonWordEntity>
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun initData(word : List<CommonWordEntity> )
}
Database
@Database(
entities = [CommonWordEntity::class],
version = 1
)
@TypeConverters(CommonWordConverter::class)
abstract class CommonWordDatabase: RoomDatabase() {
abstract val wordDao: CommonWordDao
}
Repositories
WordRepositoryImpl
class WordRepositoryImpl @Inject constructor(
private val dao: CommonWordDao,
private val assetDataSource: AssetDataSource
) : WordRepository {
override suspend fun initData() {
val wordsList = assetDataSource.getCommonWords().allData
dao.initData(wordsList.map{it.toEntity()})
}
override suspend fun getAllWords() : Flow<List<CommonWords>?> {
return flow {
emit(dao.getAllWords().map { it.words}.flatten())
}
}
}
WordRepository
interface WordRepository {
suspend fun initData()
suspend fun getAllWords() : Flow<List<CommonWords>?>
}
Use cases
getall
class GetAllCommonWordUseCase @Inject constructor(
private val repository: WordRepository
){
suspend fun getAllCommonWord() : Flow<List<CommonWords>?> {
return repository.getAllWords()
}
}
insert room
class InsertCommonWordUseCase @Inject constructor(
private val repository: WordRepository
) {
suspend fun insertCommonWord() {
repository.initData()
}
}
I think everything is correct but I think my data model may not be quite correct, based on the error because the error is caused by words. There seems to be no mistake between the naming in the json file and the naming in my data model. Unfortunately I couldn't find the problem. What can be the problem ?
EDIT
Normal json file
[
{
"word": "the",
"meaning": " “The sky is blue.” "
},
{
"word": "be",
"meaning": "be – “Will you be my friend?”"
},
{
"word": "and",
"meaning": "and – “You and I will always be friends.”"
},
{
"word": "of",
"meaning": "of – “Today is the first of November.”"
},
{
"word": "a",
"meaning": "a – “I saw a bear today.”"
},
{
"word": "in",
"meaning": "in – “She is in her room.”"
},
{
"word": "to",
"meaning": "to – “Let’s go to the park.”"
},
{
"word": "have",
"meaning": "have – “I have a few questions.”"
},
{
"word": "too",
"meaning": "too – “I like her too.”"
},
{
"word": "it",
"meaning": "it – “It is sunny outside.”"
},
{
"word": "I",
"meaning": "I – “I really like it here.”"
},
{
"word": "that",
"meaning": "that – “That door is open.”"
},
{
"word": "for",
"meaning": "for – “This letter is for you.”"
},
{
"word": "you",
"meaning": "you – “You are really nice.”"
},
it continues like this. Accordingly, how can I edit my codes or how can I fix the problem?
THE ERROR IS SOLVED
The solution for the error was caused by me. Since normally that json file doesn't have this data. I changed the name of the json file with the correct json file and the problem was solved. it was my mistake. Thank you for your answers.
