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

apeman app to handle restful endpoint.

/**
 * Endpoint for related create
 * @augments Endpoint
 * @class RelationCreateEndpoint
 */
'use strict'

const Endpoint = require('./endpoint')
const BulkRelationCreateEndpoint = require('./bulk/bulk_relation_create_endpoint')
const validateDataType = require('../validating/validate_data_type')
const validateModelExists = require('../validating/validate_model_exists')
const validateDataGiven = require('../validating/validate_data_given')

const { toType, toData, defineRelationCreate } = require('apemanmodel')
const co = require('co')

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

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

    return co(function * () {
      let { state } = ctx
      let { id, data, association } = state

      let isBulk = Array.isArray(data)
      if (isBulk) {
        return yield s.handleBulk(ctx, next)
      }

      let error = s.validate(data, state)
      if (error) {
        return fail(error)
      }

      let created = yield s.relationCreate(id, data, state)
      return succeed(
        {},
        toData.withoutAttributes(association.target, created, {})
      )
    })
  }

  /**
   * @override
   */
  validate (data, state) {
    let { association, model, id, instance } = state
    let type = toType(association.target)
    let dataGivenError = validateDataGiven(data)
    if (dataGivenError) {
      return dataGivenError
    }

    let relatedTypeError = validateDataType(data, type)
    if (relatedTypeError) {
      return relatedTypeError
    }

    let existsError = validateModelExists(model, id, instance)
    if (existsError) {
      return existsError
    }
    return null
  }

  relationCreate (id, data, state) {
    let { model, association, transaction } = state
    return co(function * () {
      let relationCreate = defineRelationCreate(model, association, transaction)
      return yield relationCreate(id, data)
    })
  }

  handleBulk (ctx, next) {
    const s = this
    let config = Object.assign({}, s.config, { name: 'bulkRelationCreate' })
    return new BulkRelationCreateEndpoint(config).handle(ctx, next)
  }
}

module.exports = RelationCreateEndpoint