Question: It is possible to join the result of a complex query to another table.

I’ve been playing around with this, trying to get it to work in Knex:

    knex.raw '''
      SELECT
        id,
        name,
        fluid_account_id,
        survey_fid,
        coalesce(assigned_client_count, 0) as assigned_client_count
      FROM (
        SELECT survey_id, count(*) as assigned_client_count
        FROM client_surveys
          GROUP BY survey_id
      ) t_counts
      RIGHT JOIN
        fluid_surveys
      ON
        t_counts.survey_id = fluid_surveys.id
      '''

Is it possible to express this without using raw? The main advantage to not using raw is that I can pass an Javascript object straight into the where function, which makes for some really clean code.

If it’s not possible to do this complex a query with knex, is it possible for me to augment this raw query with where?

This is what I hoped would work:

sub = knex 'client_surveys'
    .select [
      'survey_id'
      knex.raw 'count(*) as assigned_client_count'
    ]
    .from 'client_surveys'
    .groupBy 'survey_id'

knex 'fluid_surveys'
  .select [
    'id'
    'name'
    'fluid_account_id'
    'survey_fid'
    knex.raw 'coalesce(assigned_client_count, 0) as assigned_client_count'
  ]
  .join sub, 't_count.survey_id', '=', 'fluid_surveys.id'
  .then (result) ->
    console.log "result", result

[tgriesser]

This:

var coalesce = knex.raw('coalesce(assigned_client_count, 0) as assigned_client_count')
knex.select('id', 'name', 'fluid_account_id', 'survey_fid', coalesce)
  .from(function() {
    this.as('t_counts').select('survey_id').count('* as assigned_client_count').from('client_surveys').groupBy('survey_id')
  })
  .rightJoin('fluid_surveys', 't_counts.survey_id', 'fluid_surveys.id')

or this:

var sub = knex.select('survey_id').count('* as assigned_client_count').from('client_surveys').groupBy('survey_id')
var coalesce = knex.raw('coalesce(assigned_client_count, 0) as assigned_client_count')
knex.select('id', 'name', 'fluid_account_id', 'survey_fid', coalesce)
  .from(sub.clone().as('t_counts'))
  .rightJoin('fluid_surveys', 't_counts.survey_id', 'fluid_surveys.id')

should get what you’re after.

[rhys-vdw]

That was the problem.

Thanks again!