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

apeman app to handle restful endpoint.

/**
 * Endpoint for one
 * @augments Endpoint
 * @class RelatedOneEndpoint
 */
'use strict'

const Endpoint = require('./endpoint')

const { toData, defineOne, defineRelatedOne } = require('apemanmodel')

const validateModelExists = require('../validating/validate_model_exists')

const co = require('co')

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

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

    return co(function * () {
      let { state } = ctx
      let error = s.validate(null, state)
      if (error) {
        return fail(error)
      }
      let { model, id, relatedId, association } = state

      let relatedInstance = yield s.relatedOne(id, relatedId, state)
      let relatedExistsError = validateModelExists(model, id, relatedInstance)
      if (relatedExistsError) {
        return fail(relatedExistsError)
      }
      return succeed(
        {},
        toData(association.target, relatedInstance, {}),
        {
          self: '.'
        }
      )
    })
  }

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

  relatedOne (id, relatedId, state) {
    let { model, association, transaction } = state
    return co(function * () {
      let relatedOne = defineRelatedOne(model, association, transaction)
      return yield relatedOne(id, relatedId)
    })
  }
}

module.exports = RelatedOneEndpoint