public void caclculate_best_price(List<Goal_Items__c> goal_items){
    Map<Id, Map<Id, Map<Decimal, Decimal>>> Savings_Goals_to_Products_to_Sizes_to_Prices = build_savings_goal_to_product_price_map();
    for(Goal_Items__c goal_item: goal_items) {
        Map<Id, Map<Decimal, Decimal>> products_to_sizes_to_prices = Savings_Goals_to_Products_to_Sizes_to_Prices.get(goal_item.Goal_Items__c);
        Map<Decimal, Decimal> sizes_to_prices = null;
        if (products_to_sizes_to_prices != null) {
            sizes_to_prices = products_to_sizes_to_prices.get(goal_item.Product__c);
        System.debug('goal_item:'  + goal_item);
        if(sizes_to_prices != null){
            Map<Decimal, Decimal> cache = new Map<Decimal, Decimal>();
            Set<Decimal> product_sizes_set = sizes_to_prices.keyset();
            List<Decimal> product_sizes_list = new List<Decimal>(product_sizes_set);
            goal_item.Goal_Item_Price__c = find_best_price_and_validate_goal_item_amount(goal_item, goal_item.Desired_Units__c, cache, sizes_to_prices, product_sizes_list);
        } else {
            if (goal_item.Product__c != null) {
                goal_item.Product__c.addError('No product prices in the related Goal Item ('+ goal_item.Goal_Items__c +') Price Book for the related Product ('+ goal_item.Product__c+').');

I seem to get the below error

Method does not exist or incorrect signature: void get(Decimal)" on line number 4. Could anyone know I might be doing wrong and possible hints to resolve this

  • pro tip -- follow conventions and don't name your methods or variables with underscores. e.g. sizesToPrices, not sizes_to_prices -- avoids confusing the developer when differentiating custom field names from apex variable and methodnames.
    – cropredy
    Mar 6, 2021 at 1:55

1 Answer 1


The first key in Savings_Goals_to_Products_to_Sizes_to_Prices is expected to be of type Id but based on the error message the field goal_item.Goal_Items__c is a Decimal.

There is probably a field on Goal_Items__c that is a lookup to "Savings Goals" that you should be using instead. Take a look at your data model.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.