update PivotModel update throws Error because doesn't have function _setUpdatedAt

Hi guys! I have same problem as described in #203 I use update pivot model as documented

          await object
            .pictures()
            .pivotQuery()
            .where('picture_id', id)
            .update({ sort_order: index })

And this throws error “fakeModel._setUpdatedAt is not a function”

I’ve investigated code, and

1. Crushed when calling update in https://github.com/adonisjs/adonis-lucid/blob/b613b648cf5cb6b582be716d3b775a9778fb0d2a/src/Lucid/QueryBuilder/index.js#L521

2. pivotQuery creates PivotModel instance https://github.com/adonisjs/adonis-lucid/blob/7ed413824d858274290f57f3780e12b9bd819853/src/Lucid/Relations/BelongsToMany.js#L716-L727

3. PivotModel class extends of BaseModel https://github.com/adonisjs/adonis-lucid/blob/b613b648cf5cb6b582be716d3b775a9778fb0d2a/src/Lucid/Model/PivotModel.js#L29

4. BaseModel doesn’t have function _setUpdatedAt, this function exists only Model

[RomainLanz]

Hey @rminossi!

In the meanwhile, you can directly use the Database class to update your fields.

Database.table('table')
  .where('x', x)
  .where('y', y)
  .update({ ... })

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