apeman-app-rest/lib/endpoints/relation_list_endpoint.js

apeman app to handle restful endpoint.

/**
 * Endpoint for relation list
 * @augments Endpoint
 * @class RelationListEndpoint
 */
'use strict'

const Endpoint = require('./endpoint')

const { toData, defineRelatedGet } = require('apemanmodel')
const validateModelExists = require('../validating/validate_model_exists')

const co = require('co')

/** @lends RelationListEndpoint */
class RelationListEndpoint extends Endpoint {
  /**
   * @override
   */
  getDefaultConfig () {
    return {
      name: 'relationList'
    }
  }

  /**
   * @override
   */
  handle (ctx, next) {
    const s = this
    let succeed = s.bindSucceed(ctx)
    let fail = s.bindFail(ctx)

    let { state } = ctx
    let { association, instance } = state

    return co(function * () {
      let error = s.validate(null, state)
      if (error) {
        return fail(error)
      }

      let relation = yield s.relatedList(instance, state)

      return succeed(
        {},
        toData.withoutAttributes(association.target, relation, {}),
        {
          self: '.',
          related: `../../${association.as}`
        }
      )
    })
  }

  /**
   * @override
   */
  validate (data, state) {
    let { model, id, instance } = state
    let existsError = validateModelExists(model, id, instance)
    if (existsError) {
      return existsError
    }
    return null
  }

  relatedList (instance, state) {
    let { model, association, transaction } = state
    let relatedGet = defineRelatedGet(model, association, transaction)
    return co(function * () {
      return yield relatedGet(instance)
    })
  }
}

Object.assign(RelationListEndpoint, {})

module.exports = RelationListEndpoint