[SalesForce] Show Error Arithmetic expressions must use numeric arguments

I have a piece of code that show above error on

     d.FolderId = UserInfo.getUserId();
     d.Name = 'Data2'; 
     String myContent = this.name+ '\n ' +this.pass+ '\n ' + this.age+ '\n ' +this.mail; 
     d.body += Blob.valueof(mycontent);
     d.ContentType = 'text/plain';
     d.Type = 'txt';
     upsert d;
     return null;
 }

 d.body += Blob.valueof(mycontent);(Show error in this line)

Best Answer

Blob just doesn't work that way. You need to build up one string, and call Blob.valueOf at the end. For instance, you could do:

Blob.valueOf(myContent + myContent);

Which seems to be what you want in your example. Or, as an alternative to the code in the flagged duplicate:

Blob.valueOf('s1' + 's2' + 's3');

Related Solutions

[SalesForce] Compile Error: Comparison arguments must be compatible types

The line provoking the error is actually

System.assert(e.getDmlFields(0)[0] == 'Email');

The error is complaining that you're comparing a Schema.SObjectField value with a String, which isn't allowed. It looks like getDmlFields() has changed over the releases. I'll raise a doc bug to get that example code fixed. Changing that line to

System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Email');

should fix the error.

System.assert(condition) is used in test code to check that a given condition is true. If the condition is false, the test as a whole fails, and the location of the failure is given in the test output log.

Working through the asserts in that example:

System.assert(false); says that you should never get to that line - the insert is expected to throw an exception.
System.assert(e.getNumDml() == 1); says that the failure concerns a single record
System.assert(e.getDmlIndex(0) == 0); says that the failure was on the very first inserted record
System.assert(e.getDmlFields(0).size() == 1); says that the failure was caused by a single field in the offending record
System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Email'); says that offending field is called 'Email'
System.assert(e.getDmlMessage(0).indexOf( 'A lead with this email address already exists.') > -1); says that the error message should match the expected value.

Basically, the test method is checking that the trigger executed EXACTLY as intended!

The exception methods, such as getNumDml(), are listed here.

[SalesForce] arithmetic expression must use numeric argument

I think zdropic has identified the problem. With no other variables involved:

User.Salary__c

is an SObjectField token and can't be used in an arithmetic expression. (Its purpose is to provide a compile-time checked token that represents a field of an SObject; it can be used with SObject.get and SObject.put and in describe calls.) If you have a variable called User (or user given the Apex compiler's case insensitivity) in scope, that would normally have precedence, but it is clearer to not user variable names that are identical to object type names.

There is no global User object, there is only a global UserInfo object. So I would expect code looking like this to work here:

User u = [select Salary__c from User where Id = :UserInfo.getUserId()];
obj.Without_credit_time_off_amount__c = (u.Salary__c / 30) * obj.Days__c;

Best Answer

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[SalesForce] Compile Error: Comparison arguments must be compatible types

[SalesForce] arithmetic expression must use numeric argument

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