List has no rows for assignement to SObject Error in Salesforce Apex Class
Error: List has no rows for assignement to SObject in Salesforce,
My Case Object SOQL was something like this:
 Case caseDetail = [select id, Subject from Case where id = :caseId]
If the SOQL query for some reason would not a return a result row the error message would be raised. A way to solve this is to assign the result of the SOQL-query to an caseDetail array instead.
 Case[] caseDetail = [select id, Subject from Case where id = :caseId]
and then check with conditions using size() or isEmpty
 
caseDetail.size() OR caseDetail.isEmpty()
Example:
 if (caseDetail.size() > 0) {
 /* At least one row has been returned from the SOQL query
 If we for example are only expecting one opportunity as result then get a handle on it like this */
 caseDetail[0].subject = ‘TheBlogReaders.com’;
 update caseDetail[0];
 } else {
 // Query was empty
 }
