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cristian.devcristian.dev 

Trigger development: Illegal assignment from Schema.SObjectField to Double

Hi all.

I'm writing my first trigger on SalesForce.

The goal would be: determine the value of a proposal (Proposal__c) updating its field called Proposal_Value__c (Currency), getting the sum of Item_Value__c(currency) that resides in a Proposal child object.

The trigger should be called inserting, updating or deleting a proposal Line_Item

trigger updateProposal on Proposal_Line__c (after delete, after insert, after update) {
	
	Double proposalValue = Proposal__c.Proposal_Value__c;
	
	List proposalLines =
	[SELECT  j.Proposal_Line_Value__c FROM Proposal_Child__c j FOR UPDATE];
	
	for (Proposal_Child__c pl: proposalLines) {
		
		proposalValue += pl.Proposal_Line_Value__c;	
    }
    update proposalValue ;
}

I have an error declaring proposalValue (the first variable): Illegal assignment from Schema.SObjectField to Double

I've also checked in the schema explorer that says this variable is of Double type.

 

Thanks for any suggestion.

bob_buzzardbob_buzzard

In this line:

 

Double proposalValue = Proposal__c.Proposal_Value__c;

 

Proposal__c is an object type definition, so Proposal__c.Proposal_Value__c is simply a field definition.

 

You'll need to retrieve an instance of Proposal__c and use that to set your initial value.  
Lucy YuanLucy Yuan

hi

Error in line 2.

you can't get the proposal_value__c property until there is no proposal__c instance initalized!