title: No converter found capable of converting from type java.lang.Double to type java.lang.Long when fetching a Mongo collection using GORM
body: <p>My model is:</p>
  
  <pre><code>package com.apposit.terra.connect.model
  
  import java.util.Date;
  
  import com.apposit.connect.security.User;
  import com.apposit.terra.connect.FertilizerTypeEnum
  import com.apposit.terra.connect.InputTypeEnum
  import com.apposit.terra.connect.model.AbstractDomain
  
  class UnionAllocation extends AbstractDomain {
  
      static mapWith = "mongo"
  
      Organization union
      InputTypeEnum inputType
      FertilizerTypeEnum fertilizerType
      CommodityType seedType
      InputCommodityType seedVariety
      Double requestedAmount = 0.0
      Double allocatedAmount = 0.0
      Double deliveredAmount = 0.0
      Double remaining  = 0.0
      Organization supplier
      Date expectedCompletionDate
  
      Date dateCreated
      Date lastUpdated
      User createdByUser
      User updatedByUser
  
  
      static constraints = {
          union(nullable: false )
          inputType(nullable: false)
          fertilizerType( nullable: true, unique: 'union')
          seedType( nullable: true)
          seedVariety( nullable: true, unique: 'union' )
          allocatedAmount( nullable: false)
          supplier( nullable: true)
          requestedAmount( nullable: true)
          createdByUser( nullable: true )
          updatedByUser( nullable: true )
      }
  
      static mapping = {
          id generator: 'identity'
          sort id: "desc"
      }
  }
  </code></pre>
  
  <p>And my collection looks like:</p>
  
  <pre><code>/* 0 */
  {
      "_id" : NumberLong(14),
      "allocatedAmount" : 450,
      "dateCreated" : ISODate("2014-03-07T05:22:16.832Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-17T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-07T05:25:17.996Z"),
      "remaining" : 400,
      "requestedAmount" : 400,
      "seedType" : NumberLong(4),
      "seedVariety" : NumberLong(122),
      "supplier" : NumberLong(1406),
      "union" : NumberLong(1702),
      "version" : NumberLong(1)
  }
  
  /* 1 */
  {
      "_id" : NumberLong(15),
      "allocatedAmount" : 800,
      "dateCreated" : ISODate("2014-03-07T14:17:02.006Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-19T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-07T14:17:02.006Z"),
      "remaining" : 800,
      "requestedAmount" : 800,
      "seedType" : NumberLong(4),
      "seedVariety" : NumberLong(109),
      "supplier" : NumberLong(1406),
      "union" : NumberLong(1757),
      "version" : NumberLong(0)
  }
  
  /* 2 */
  {
      "_id" : NumberLong(17),
      "allocatedAmount" : 12645.5,
      "dateCreated" : ISODate("2014-03-08T17:22:00.053Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-05-08T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-08T17:24:08.372Z"),
      "remaining" : 126455,
      "requestedAmount" : 12434,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1702),
      "version" : NumberLong(1)
  }
  
  /* 3 */
  {
      "_id" : NumberLong(19),
      "allocatedAmount" : 2210,
      "dateCreated" : ISODate("2014-03-08T17:27:21.759Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-05-08T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-08T17:27:21.759Z"),
      "remaining" : 2210,
      "requestedAmount" : 0,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1617),
      "version" : NumberLong(0)
  }
  
  /* 4 */
  {
      "_id" : NumberLong(20),
      "allocatedAmount" : 21068,
      "dateCreated" : ISODate("2014-03-08T17:29:25.274Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-05-08T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-08T17:29:25.274Z"),
      "remaining" : 21068,
      "requestedAmount" : 16227,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1664),
      "version" : NumberLong(0)
  }
  
  /* 5 */
  {
      "_id" : NumberLong(21),
      "allocatedAmount" : 3000,
      "dateCreated" : ISODate("2014-03-10T04:54:30.172Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-30T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-10T04:54:30.172Z"),
      "remaining" : 3000,
      "requestedAmount" : 3000,
      "seedType" : NumberLong(6),
      "seedVariety" : NumberLong(93),
      "supplier" : NumberLong(1406),
      "union" : NumberLong(1430),
      "version" : NumberLong(0)
  }
  
  /* 6 */
  {
      "_id" : NumberLong(22),
      "allocatedAmount" : 5000,
      "dateCreated" : ISODate("2014-03-11T13:25:09.123Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-21T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-11T13:25:09.123Z"),
      "remaining" : 5000,
      "requestedAmount" : 5000,
      "seedType" : NumberLong(13),
      "seedVariety" : NumberLong(54),
      "supplier" : NumberLong(1406),
      "union" : NumberLong(2076),
      "version" : NumberLong(0)
  }
  
  /* 7 */
  {
      "_id" : NumberLong(23),
      "allocatedAmount" : 5000,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-13T05:34:59.047Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-28T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-13T05:34:59.047Z"),
      "remaining" : 5000,
      "requestedAmount" : 5000,
      "seedType" : NumberLong(4),
      "seedVariety" : NumberLong(110),
      "supplier" : NumberLong(1406),
      "union" : NumberLong(2079),
      "version" : NumberLong(0)
  }
  
  /* 8 */
  {
      "_id" : NumberLong(24),
      "allocatedAmount" : 1000,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-13T06:10:40.031Z"),
      "deliveredAmount" : 300,
      "expectedCompletionDate" : ISODate("2014-05-31T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-25T11:36:51.085Z"),
      "remaining" : 1000,
      "requestedAmount" : 1000,
      "seedType" : NumberLong(6),
      "seedVariety" : NumberLong(94),
      "supplier" : NumberLong(1407),
      "union" : NumberLong(1523),
      "version" : NumberLong(1)
  }
  
  /* 9 */
  {
      "_id" : NumberLong(25),
      "allocatedAmount" : 6000,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-13T08:37:27.129Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-30T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-13T08:37:27.129Z"),
      "remaining" : 6000,
      "requestedAmount" : 12000,
      "seedType" : NumberLong(6),
      "seedVariety" : NumberLong(94),
      "supplier" : NumberLong(1407),
      "union" : NumberLong(1496),
      "version" : NumberLong(0)
  }
  
  /* 10 */
  {
      "_id" : NumberLong(26),
      "allocatedAmount" : 500,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-13T12:43:47.693Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-30T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-13T12:43:47.693Z"),
      "remaining" : 500,
      "requestedAmount" : 500,
      "seedType" : NumberLong(6),
      "seedVariety" : NumberLong(92),
      "supplier" : NumberLong(1407),
      "union" : NumberLong(1496),
      "version" : NumberLong(0)
  }
  
  /* 11 */
  {
      "_id" : NumberLong(27),
      "allocatedAmount" : 0,
      "createdByUser" : NumberLong(90),
      "dateCreated" : ISODate("2014-03-13T23:26:00.044Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-05-08T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-13T23:26:00.044Z"),
      "remaining" : 0,
      "requestedAmount" : 34506,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(2079),
      "version" : NumberLong(0)
  }
  
  /* 12 */
  {
      "_id" : NumberLong(28),
      "allocatedAmount" : 0,
      "createdByUser" : NumberLong(90),
      "dateCreated" : ISODate("2014-03-13T23:31:04.347Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-05-08T21:00:00.000Z"),
      "fertilizerType" : "UREA",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-13T23:31:04.347Z"),
      "remaining" : 0,
      "requestedAmount" : 26952,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(2079),
      "version" : NumberLong(0)
  }
  
  /* 13 */
  {
      "_id" : NumberLong(29),
      "allocatedAmount" : 25000,
      "createdByUser" : 97,
      "dateCreated" : ISODate("2014-03-14T05:21:25.536Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-31T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-14T05:21:25.536Z"),
      "remaining" : 25000,
      "requestedAmount" : 25000,
      "seedType" : NumberLong(13),
      "seedVariety" : NumberLong(83),
      "supplier" : NumberLong(2156),
      "union" : NumberLong(2079),
      "version" : NumberLong(0)
  }
  
  /* 14 */
  {
      "_id" : NumberLong(30),
      "allocatedAmount" : 25000,
      "createdByUser" : 97,
      "dateCreated" : ISODate("2014-03-14T05:21:48.485Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-03-31T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-14T05:21:48.485Z"),
      "remaining" : 25000,
      "requestedAmount" : 25000,
      "seedType" : NumberLong(13),
      "seedVariety" : NumberLong(84),
      "supplier" : NumberLong(2156),
      "union" : NumberLong(2079),
      "version" : NumberLong(0)
  }
  
  /* 15 */
  {
      "_id" : NumberLong(31),
      "allocatedAmount" : 3000,
      "createdByUser" : 97,
      "dateCreated" : ISODate("2014-03-17T13:02:05.912Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-04-29T21:00:00.000Z"),
      "inputType" : "SEED",
      "lastUpdated" : ISODate("2014-03-17T13:02:05.912Z"),
      "remaining" : 3000,
      "requestedAmount" : 5000,
      "seedType" : NumberLong(4),
      "seedVariety" : NumberLong(126),
      "supplier" : NumberLong(1407),
      "union" : NumberLong(1686),
      "version" : NumberLong(0)
  }
  
  /* 16 */
  {
      "_id" : NumberLong(32),
      "allocatedAmount" : 2000,
      "createdByUser" : 97,
      "dateCreated" : ISODate("2014-03-17T13:14:25.379Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-05-30T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-17T13:14:25.379Z"),
      "remaining" : 2000,
      "requestedAmount" : 2000,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1686),
      "version" : NumberLong(0)
  }
  
  /* 17 */
  {
      "_id" : NumberLong(33),
      "allocatedAmount" : 8000,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-19T10:28:02.631Z"),
      "deliveredAmount" : 0,
      "expectedCompletionDate" : ISODate("2014-06-29T21:00:00.000Z"),
      "fertilizerType" : "UREA",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-19T10:28:02.631Z"),
      "remaining" : 8000,
      "requestedAmount" : 10000,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1702),
      "version" : NumberLong(0)
  }
  
  /* 18 */
  {
      "_id" : NumberLong(34),
      "allocatedAmount" : 5000,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-25T14:39:07.030Z"),
      "deliveredAmount" : 1000,
      "expectedCompletionDate" : ISODate("2014-06-29T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-25T14:39:07.030Z"),
      "remaining" : 5000,
      "requestedAmount" : 10000,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1757),
      "version" : NumberLong(0)
  }
  
  /* 19 */
  {
      "_id" : NumberLong(35),
      "allocatedAmount" : 6000,
      "createdByUser" : NumberLong(97),
      "dateCreated" : ISODate("2014-03-25T14:39:32.458Z"),
      "deliveredAmount" : 2000,
      "expectedCompletionDate" : ISODate("2014-06-29T21:00:00.000Z"),
      "fertilizerType" : "DAP",
      "inputType" : "FERTILIZER",
      "lastUpdated" : ISODate("2014-03-25T14:39:32.458Z"),
      "remaining" : 6000,
      "requestedAmount" : 10000,
      "supplier" : NumberLong(1405),
      "union" : NumberLong(1523),
      "version" : NumberLong(0)
  }
  </code></pre>
  
  <p>When I do <code>UnionAllocation.list()</code> I get: </p>
  
  <pre><code>org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type java.lang.Double to type java.lang.Long
      at org.grails.datastore.mapping.model.types.conversion.DefaultConversionService.convert(DefaultConversionService.java:21)
      at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.refreshObjectStateFromNativeEntry(NativeEntryEntityPersister.java:478)
      at org.grails.datastore.mapping.mongo.engine.MongoEntityPersister.refreshObjectStateFromNativeEntry(MongoEntityPersister.java:110)
      at org.grails.datastore.mapping.mongo.engine.MongoEntityPersister.refreshObjectStateFromNativeEntry(MongoEntityPersister.java:78)
      at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.createObjectFromNativeEntry(NativeEntryEntityPersister.java:379)
      at org.grails.datastore.mapping.mongo.query.MongoQuery$MongoResultList.convertDBObject(MongoQuery.java:993)
      at org.grails.datastore.mapping.mongo.query.MongoQuery$MongoResultList$1.next(MongoQuery.java:967)
  </code></pre>