feat(models): base model delete by ids returns number of affected rows

BREAKING CHANGE:
deleteByIds does not return ids but number of rows now

src/models/__tests__/base.model.test.js

@@ -303,7 +303,7 @@ describe('Base model', () => {
     const newEntity2 = await Fake.insert({})
     const affectedRows = await Fake.deleteByIds([newEntity1.id, newEntity2.id])
     const { result } = await Fake.find({})
-    expect(affectedRows).toEqual([newEntity1.id, newEntity2.id])
+    expect(affectedRows).toEqual(2)
     expect(result).toHaveLength(0)
   })
 

src/models/base.model.js

@@ -363,7 +363,7 @@ class BaseModel extends Model {
         .whereIn('id', ids)
         .returning('id')
 
-      return result.map(u => u.id)
+      return result.length
     } catch (e) {
       logger.error(`${this.name} model: deleteByIds failed`, e)
       throw new Error(e)