Questions tagged [android-room-relation]
69 questions
1
vote
1 answer
Android Room Subquery unmatched field error
I can't figure out how to bind a subquery select within an attribute of the entity, I simply need to bind the "main_game" subquery into the mainGame String attribute of my entity:
My DAO:
@Dao
public interface GamesDao {
@Query("SELECT *,…
Nexussim Lements
- 535
- 1
- 15
- 47
1
vote
1 answer
Android Room `@Relation` to a class with `@Embedded` entities
I have 3 tables A, X, Y. Records of A are defined by pairs of X and Y - in another table AWithXY. I can model A the way I receive list of X or Y in a list like below:
data class AWithXY(
@Embedded val a: A,
@Relation(
parentColumn =…
Luke
- 2,539
- 2
- 23
- 40
1
vote
1 answer
Parameter specified as non-null is null exception with Room Relations
I've defined a model that represents a meeting, with a menu and a workout plan.
The menu has a list of courses, each of which has a list of meals, and the workout plan has a list of exercises.
[
{
"menu": {
"courses": [
{
…
DaniLiat
- 45
- 5
1
vote
1 answer
How to avoid duplicate data in roomdatabase?
I am creating an app for my students. I am a teacher and hobby developer. Therefore, I need help. With three fragments, I successively create the name of the class, and the data of the student(first Name, last Name,..) then I attribute evaluation…
Wowocode
- 23
- 3
1
vote
1 answer
Android Room Relations get limited fields from embedded model
I have a model like that
class UserWithPets {
@Embedded
var user: User? = null
@Relation(
parentColumn = "id",
entityColumn = "userId"
)
var pets: List = ArrayList()
}
with models
data class User(
val…
Guigui
- 127
- 2
- 8
1
vote
1 answer
One to many relationship in Room Database
There is an event in my project and there are timelines in this event. Each event has its own timelines. I want to list the timelines of each event with the codes I have written, but I cannot access it via the adapter.
My…
user11143033
1
vote
2 answers
POJO within POJO, Entity-Relation problem
I have five tables in my database: AREA, AREA_TYPE, SAMPLE, PACK, UNIT
@Entity(tableName = "AREA")
data class AreaEntity(
@PrimaryKey val id:String,
val title:String,
@ColumnInfo(name = "area_type_id") val…
rahman kalınbaçoğlu
- 21
- 5
1
vote
0 answers
Room relational query method with paging
In Room 2.4, there is a new feature called relational query method in DAO which you can write your custom query to select columns from 2 entities and Room can be able to aggregate into Map> return type.
I have a fairly…
Eric Li
- 143
- 1
- 8
1
vote
2 answers
Best way to deserialize Json with nested objects into Android Room Entity with ForeignKeys
I have a Client api. The json response looks like this:
{
"clientId": 1,
"createdAt": null,
"updatedAt": null,
"monthlyPaymentAmount": null,
"person": {
// Omitted data here
},
"paymentType": {
// Omitted…
Jesus Jimenez
- 351
- 1
- 3
- 13
1
vote
0 answers
Android Room + AutoValue breaks schema generation
I have a rather complicated (though not entirely unusual) scenario that seems to break with Android Room version 2.4.0 (specifically 2.4.0-beta01. It works on 2.4.0-alpha05).
I'll put the code down below, but I'll attempt to describe my situation in…
skywalkerdude
- 117
- 1
- 8
1
vote
1 answer
Android Room belongsTo (one to one) relationship
Let's say I have an Article table like this:
Article {
id;
title;
content;
main_reference_id;
secondary_reference_id;
}
And there is a Reference table somewhat like this:
Reference {
id;
…
Riajul
- 1,140
- 15
- 20
1
vote
1 answer
triple join in room database using room relation
I need to triple join my entities using @relation anotion in room, but I don't know how.
here is my summary of entities:
@Entity(tableName = "session_table")
data class Session(
@PrimaryKey(autoGenerate = true)
var sessionId: Long = 0L,
…
amir kazemzade
- 21
- 3
1
vote
1 answer
Room SELECT Query for 1-n hashmap relationship
I have the following ORM model:
Basically I want to track all public facilities of a state. So I have 1-n Relationship with a public facility like e.g. school:
public class StateWithFacilities {
@Embedded
State state;
@Relation(entity…
Nummer Eins
- 199
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- 8
1
vote
1 answer
Efficient way for Inheritance Table schemes
I'm planning to display an listview of CarServiceEntries.
The CarServiceEntry class contains basic data of a service:
@Entity
abstract class CarServiceEntry(
private int id;
private Date date;
private float odometer;
/*
…
igodie
- 497
- 1
- 4
- 16
1
vote
1 answer
How to insert, update and delete a many-to-many relationship in android room?
Following the Android documentation for many-to-many relations, found here: Define many-to-many relationships
I have the following entities
@Entity
class Song(
@PrimaryKey val songId: Long,
@ColumnInfo val name: String,
@ColumnInfo val…
Kamalpreet Singh
- 45
- 7