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Can anyone clearly explain what exact use of DescribeFieldResult Class in Apex code. And also please provide an example.

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The DescribeFieldResult Class contains methods which provide you the metadata info about a field on a sObject from which you have fetched the DescribeFieldResult instance:

For example:

Schema.DescribeFieldResult fieldResult =
                                  Schema.SObjectType.Custom_Object__c.fields.Status__c;

If you have a close look at the documentation of DescribeFieldResult class available in the Salesforce docs, you will see that you get the length of the field, if its a formula field then you can even get the formula within that field, the default value etc.

There could be multiple use cases wherein you would need such information:

One sample use case might be to create a Select * from... SQL equivalent in SOQL. This is explained very well in a blog here.

Another use case would be to fetch the metadata from each of the fields of the object and compare it with another to figure out the difference (ex: record or object metadata comparison in sandbox vs prod) This Chrome extension relies heavily on such metadata returned by the DescribeFieldResult class and shows you the difference between two records/objects and their metadata.

Hope this helps.

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  • In a object I have created a picklist feild ,but the pick list values are stored in translation settings can i get those values using these methods – user18601 Apr 11 '15 at 9:58
  • And also explain schema class what is use in sales force ? – user18601 Apr 11 '15 at 10:04
  • for translation settings i guess metadata api is the only option salesforce.com/us/developer/docs/api_meta/Content/… – Rajiv Bhatt Apr 11 '15 at 10:10
  • The schema class is used to get the metadata of your entire salesforce org, imagine accessing any object, any fields on those objects, extracting datatype info, tabs etc. – Rajiv Bhatt Apr 11 '15 at 10:13
  • I just found this "Use toLabel(fields) to translate SOQL query results into the user’s language" see if you can use this to get the translated piclist values salesforce.com/us/developer/docs/soql_sosl/Content/… – Rajiv Bhatt Apr 11 '15 at 18:11

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