I've been running into the following exception at runtime with the debugger trying to de-serialize data from my Algolia index for my Kotlin Android recipe app I am trying to create by using the Kotlinx.Serialization library. The app compiles and runs fine, but no results show on the UI.
kotlinx.serialization.json.JsonDecodingException: Unexpected JSON token at offset -1: Failed to parse 'int'.
JSON input: {"amount":1.5,"name":"green beans","original":"1.5 pounds of green beans","unit":"pounds","unitLong":"pounds","unitShort":"lbs"}
Now from the looks this exception, It looks like the de-serializer is getting confused try to de-serialize my Ingredients data class. How would I go about de-serializing it?.
Example JSON data that is being sent over.
{
"cuisine": "European",
"diet": "Vegetarian",
"difficulty": 2,
"dishType": "Dinner",
"duration": 30,
"durationUnit": "minutes",
"image": "https://c.recipeland.com/images/r/1396/12f9fc271d8f1bfac5f6_550.jpg",
"ingredients": [
{
"amount": 1.5,
"name": "green beans",
"original": "1.5 pounds of green beans",
"unit": "pounds",
"unitLong": "pounds",
"unitShort": "lbs"
},
{
"amount": 1,
"name": "onion",
"original": "1.5 medium onion",
"unit": "medium",
"unitLong": "medium",
"unitShort": "med"
},
{
"amount": 2,
"name": "garlic",
"original": "2 teaspoons of garlic",
"unit": "teaspoons",
"unitLong": "teaspoons",
"unitShort": "tsps"
},
{
"amount": 1,
"name": "olive oil",
"original": "1 teaspoon olive oil",
"unit": "teaspoon",
"unitLong": "teaspoon",
"unitShort": "tsps"
},
{
"amount": 1,
"name": "mushrooms",
"original": "1 cup mushrooms",
"unit": "cup",
"unitLong": "cup",
"unitShort": "cup"
},
{
"amount": 1,
"name": "cherry tomatoes",
"original": "1 cup cherry tomatoes",
"unit": "cup",
"unitLong": "cup",
"unitShort": "cup"
}
],
"name": "Green Beans with Mushrooms and Cherry Tomatoes",
"preparation": [
"Steam green beans until tender.",
"Drain and set aside. Sauté onion and garlic in a medium skillet coated with olive oil, until tender. About 2 to 3 minutes.",
"Add mushrooms and sauté until tender. Stir in green beans and tomotoes until heated."
],
"yield": 4,
"objectID": "0"
}
I have my data classes for a recipe set up as the following:
Recipe.kt
@IgnoreExtraProperties
@Serializable
data class Recipe(
var difficulty: Int = 0,
var dishType: String? = null,
var duration: Int = 0,
var durationUnit: String? = null,
var image: String? = null,
var diet: String? = null,
var cuisine: String? = null,
var name: String? = null,
var ingredients: List<Ingredient> = emptyList(),
var preparation: List<String> = emptyList(),
var yield: Int = 0
) {
Ingredient.kt
@Serializable
data class Ingredient(
var amount: Int = 0,
var name: String? = null,
var original: String? = null, // Original text of the ingredient
var unit: String? = null,
var unitLong: String? = null,
var unitShort: String? = null
)
This block of code I got from Algolia's getting started guide for InstantSearch Android that de-serializes the data from the index.
private val datasourceFactory = SearcherSingleIndexDataSource.Factory(searcher) { hit ->
hit.deserialize(Recipe.serializer()) // Problem line I assume
}
val pagedListConfig = PagedList.Config.Builder().setPageSize(50).build()
val recipes: LiveData<PagedList<Recipe>> =
LivePagedListBuilder(datasourceFactory, pagedListConfig).build()
val searchBox =
SearchBoxConnectorPagedList(searcher, listOf(recipes))
I've tried to manually create the object by using the following code, but I run into issues when trying to create the list of ingredients.
val dataSourceFactory = SearcherSingleIndexDataSource.Factory(searcher) { hit ->
Recipe(
hit.json.getPrimitive("difficulty").content.toInt(),
hit.json.getPrimitive("dishType").content,
hit.json.getPrimitive("duration").content.toInt(),
hit.json.getPrimitive("durationUnit").content,
hit.json.getPrimitive("image").content,
hit.json.getPrimitive("diet").content,
hit.json.getPrimitive("cuisine").content,
hit.json.getPrimitive("name").content,
listOf(
Ingredient(
hit.json.getPrimitive("amount").content.toInt(),
hit.json.getPrimitive("name").content,
hit.json.getPrimitive("original").content,
hit.json.getPrimitive("unit").content,
hit.json.getPrimitive("unitLong").content,
hit.json.getPrimitive("unitShort").content
)
),
hit.json.getArray("preparation").content.map { prep -> prep.content },
hit.json.getPrimitive("yield").content.toInt()
)
}
I'm not 100% sure if I'm properly creating the preparation property member correctly as well as the whole creating the list of ingredients has side-tracked me. Any help would be greatly be appreciated and I apologize for my first post on here being a long one. I've been going at this for a couple of days already and I'm stumped as to what to do next.
