fix(deserializer): unable to create polymorphic relationship digitals…

…adhu#298

lib/deserializer.js

@@ -1,6 +1,7 @@
 'use strict'
 
 var _ = require('lodash')
+var utils = require('./utils')
 
 function defaultBeforeDeserialize (options, cb) {
   cb(null, options)
@@ -79,6 +80,20 @@ function belongsToRelationships (options) {
       options.result[fkName] = null
     } else {
       options.result[fkName] = relationship.data.id
+      if (serverRelation.polymorphic) {
+        // Find the model which has a plural matching 'data.type'
+        // Allow case insensitive match
+        var relatedType = relationship.data.type.toLowerCase()
+        var modelName = _.findKey(model.app.models, function (model) {
+          var plural = utils.pluralForModel(model)
+          return plural.toLowerCase() === relatedType
+        })
+        if (!modelName) {
+          return false
+        }
+        var discriminator = serverRelation.polymorphic.discriminator
+        options.result[discriminator] = modelName
+      }
     }
   })
 }