herbs2knex dont works for singleton

[italojs]

I noted when I use the same instance for multiple actions on database, some queries just get in bug after first database operation.

Here I wrote an demo that I did an insert, findbyid and update but the update method throw an exception

TypeError: Cannot read property 'id' of undefined
at Object.get [as id] (/Users/italojs/dev/herbjs/herbs2knex/xp/node_modules/herbs2knex/src/dataMapper.js:121:48)
at Function.fromJSON (/Users/italojs/dev/herbjs/herbs2knex/xp/node_modules/gotu/src/baseEntity.js:119:96)
at DataMapper.toEntity (/Users/italojs/dev/herbjs/herbs2knex/xp/node_modules/herbs2knex/src/dataMapper.js:19:28)
at UserRepository.update (/Users/italojs/dev/herbjs/herbs2knex/xp/node_modules/herbs2knex/src/repository.js:164:28)
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async main (/Users/italojs/dev/herbjs/herbs2knex/xp/index.js:48:21)

I believe it can be an bug. To solve it, basically we can

1. Removes the singleton runner into Repository

2. Creates a new Knex Builder for each query like:

   
   [...]
   async insert(entityInstance) {
   [...]
   const ret = await this.knex(this.tableQualifiedName) // here
     .returning(fields)
     .insert(payload)
   [...]
   }
   
   async update(entityInstance) {
   [...]
   const ret = await this.knex(this.tableQualifiedName) // here
     .where(tableIDs[0], entityInstance[tableIDs[0]])
     .returning(fields)
     .update(payload)
   
   [...]
   }

[...]

[jhomarolo]

@italojs , thank you for your contribution.

I merged and updated the knex version. Could you send a PR with the updated version in the todo-list?