Changes to Lightning Data Services (LDS) in Summer'17 Release

Lightning Data Service is used to load, create, edit, or delete a record in Lightning component, without using server side Apex code. Lightning Data Service takes care of sharing rules and field-level security.

Below are changes to LDS in Summer'17 Release

• force:recordPreview has been deprecated. Now use force:recordData instead of force:recordPreview. 
• targetFields attribute is added to force:recordData, which is populated with a simplified view of the record’s fields. targetFields is automatically updated a record changes.
• The targetRecord attribute of force:recordData,  has been updated to return records in a new format. 

Old JSON format was :
{

    "AnnualRevenue": null,

    "BillingCity": "Toronto",

    "CreatedById": "005R0000000IXV3IAO",

"CreatedBy.Name": "Admin User",

"CreatedBy": {

        "Id": "005R0000000IXV3IAO",

        "Name": "Admin User",

        "sobjectType": "User"

    }

}

New JSON Format is:
{
  "apiName": "Account",
  "fields": {
  "AnnualRevenue": {
  "displayValue": null,
  "value": null
  },
  "BillingCity": {
  "displayValue": null,
  "value": "Toronto"
  },
  "CreatedBy": {
  "displayValue": "Admin User",
  "value": {
  "apiName": "User",
  "fields": {
  "Id": {
  "displayValue": null,
  "value": "005R0000000IXV3IAO"
  },
  "Name": {
  "displayValue": null,
  "value": "Admin User"
  }
  },
  "id": "005R0000000IXV3IAO",
  "recordTypeInfo": null
  }
  },
  "CreatedById": {
  "displayValue": null,
  "value": "005R0000000IXV3IAO"
  }
  }
 }

The following example shows the targetFields attribute within the force:recordData component.

<force:recordData aura:id="skss"  recordId="{!v.recordId}"  layoutType="{!v.layout}"
  fields="{!v.fieldsToQuery}"  mode="VIEW"   targetRecord="{!v.record}"
  targetFields="{!v.simpleRecord}"   targetError="{!v.error}" />

For complete understanding of LDS along with code, refer Lightning Data Services : Way to perform operation on records without using server-side Apex class  blog

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