``` Database entities = Something class version = 1 exportSc

Question

``` Database entities = Something class version = 1 exportSchema = false abstract class MyDatabase RoomDatabase abstract fun myDao MyDao companion object Volatile private var INSTANCE MyDatabase = null fun getInstance context Context MyDatabase = INSTANCE synchronized this INSTANCE buildDatabase context also INSTANCE = it private fun buildDatabase context Context = Room databaseBuilder context applicationContext MyDatabase class java sample db allowMainThreadQueries build ```

salomonbrys · Answer

Can you be more specific about what you are trying to achieve

streetsofboston · Answer

First is is `MyDatabase` or `BrewDatabase` Let s assume it is `BrewDatabase` Remove the `companion object` stuff Then have a module with a binding or just a binding that is something like this ``` bind lt BrewDatabase gt with singleton Room databaseBuilder instance BrewDatabase class java sample db allowMainThreadQueries build ```

streetsofboston · Answer

All the rest is annotation driven and kodein or any other DI SL cannot help here

Joan Colmenero · Answer

I want to DI this MyDatabase object like I m doing with all my Presenter Activity etc but now I never did it before so I want to call for instance this MyDao from everywhere on my APP because now I m doing MyDatabase myDao anyMethod and I want to achieve something like I m doing with my Repository or Usecase that I have a service as a parameter and I can use them so I don t know the way to move this into DI so I can use it from any other class instead of doing always MyDatabase getInstance this myDao someMethod

Joan Colmenero · Answer

Is it clear

Joan Colmenero · Answer

< streetsofboston> don t get what you are trying to say with gt All the rest is annotation driven and kodein or any other DI SL cannot help here

streetsofboston · Answer

The annotation creates source code a class that is a subclass of MyDatabase or BrewDatabase The call to Room databaseBuilder will return you an instance of that subclass

Joan Colmenero · Answer

Yes my question is can I avoid using MyDatabase getInstance this myDao insertUser someUser eveytime I mean avoid this `MyDatabase getInstance this myDao `

streetsofboston · Answer

The you can do `val myDb MyDatabase by kodein instance ` just like any other kodein dependency

streetsofboston · Answer

Also is it MyDatabase or BrewDatabase

streetsofboston · Answer

Ah You corrected it it s MyDatabase grinning

streetsofboston · Answer

And then you can use `myDb myDao ` etc

Joan Colmenero · Answer

So I don t have to create a module for this

Joan Colmenero · Answer

As I m doing with the rest of my stuff

streetsofboston · Answer

You could It depends Modules are just for your own organization of the code

Joan Colmenero · Answer

Ahhh Yes sorry so I can create a module called databaseModule and inside put something like bind lt MyDatabase gt with singleton Room databaseBuilder context applicationContext MyDatabase class java sample db allowMainThreadQueries build

Joan Colmenero · Answer

Is that correct

Joan Colmenero · Answer

So I have to remove all of the companionObject thing right

streetsofboston · Answer

Yup exactly You can even make the context applicationContext a dependency from another module on which this dependency depends grinning

streetsofboston · Answer

Yup either use the kodein stuff or use the companion object construct

Joan Colmenero · Answer

Oh true I need the context

Joan Colmenero · Answer

But how do I create a Bind for the context

Joan Colmenero · Answer

Should be something like this <https github com Kodein Framework Kodein DI issues 32 issuecomment 242915281> but I m not getting app as a parameter I have this ``` val contextModule = Kodein Module contextModule bind lt Context gt with instance ```

streetsofboston · Answer

That looks recursive the above code snippet `bind lt MyApplication gt with singleton MyApplication INSTANCE ` And MyApplication is your Application subclass which is a Context subclass as well Be sure to get the dependency in your Database Module using `instance lt MyApplication gt ` though

Joan Colmenero · Answer

< salomonbrys> You know about it How can I bind the context So I can use to create the Room databaseBuilder context applicationContext

romainbsl · Answer

You could also use a factory and passing the context to retrieve the right instance like

romainbsl · Answer

``` Binding bind lt Database gt with factory ctx gt Room databaseBuilder ctx Retrieving val db Database by kodein instance arg = context ```