Android Room persistence library @Update not working

Question

I am trying to update my database via new android room library, but it is not working. Here it is my approach

@IgnoreExtraProperties
@Entity(tableName = CarModel         


        

Answer 1

The update means you fetch a CarModel which is already in the database and after updating this CarModel you return the new values to the Database, except the Id you return the same Id

what to do

you need for example a global variable of type CarModel and implement set functions in the CarModel

In MainActivity assignt the fetched CarModel to the global variable and use the set functions to update the values of member variables of the CarModel

then pass this global variable to the update function in MainActivity

I have example in my Github like this