# Get campaign price for different variant inside custom price calculation

**URL:** <https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188>\
**Category:** Questions\
**Tags:** litium-7\
**Created:** [August 26, 2021, 9:13am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188 "2021-08-26T09:13:48Z")\
**Posts on this page:** 11\
**Page:** 1

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**Author:** ![kdxperbol](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/kdxperbol/32/513_2.png) [@kdxperbol](https://forum.litium.com/u/kdxperbol)\
**Post date:** [August 26, 2021, 9:13am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/1 "2021-08-26T09:13:48Z")

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We currently use the PriceListItemService to get prices for variants. But this does not give us “current” prices, i.e. the prices that the current user (anonymous or not) would see after all campaigns are applied. It seems to just give list prices, as the name implies.

How do we get the same prices that the rest of Litium does? Should we use a campaign price service? Or is there some other way of getting prices?

_Litium version: 7.6.2 & accelerator_

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**Author:** ![kdxperbol](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/kdxperbol/32/513_2.png) [@kdxperbol](https://forum.litium.com/u/kdxperbol)\
**Post date:** [August 26, 2021, 10:24am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/2 "2021-08-26T10:24:58Z")

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I need to get the price in an API controller action, so it doesn’t look like I can use the `ProductPriceModelBuilder`.

I can see there is a `CampaignPriceCalculator` that can `GetCampaignPrices`, but it looks complicated to use.

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**Author:** ![utku](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/utku/32/62_2.png) [@utku](https://forum.litium.com/u/utku)\
**Post date:** [August 26, 2021, 11:23am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/3 "2021-08-26T11:23:37Z")

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Why don’t you use Litium.Web.Models.Products.ProductPriceModelBuilder.Build method?

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**Author:** ![kdxperbol](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/kdxperbol/32/513_2.png) [@kdxperbol](https://forum.litium.com/u/kdxperbol)\
**Post date:** [August 26, 2021, 11:26am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/4 "2021-08-26T11:26:55Z")

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> [@kdxperbol](#):
>
> I need to get the price in an API controller action, so it doesn’t look like I can use the `ProductPriceModelBuilder` .

Or is there a way to get that working?

> Dependency cycle has been detected when trying to resolve component ‘Litium.Web.Models.Products.ProductPriceModelBuilder (231bd0c8-b3f8-4eb8-8c25-2eb62ff87615)’.  
> The resolution tree that resulted in the cycle is the following:  
> Component ‘Litium.Web.Models.Products.ProductPriceModelBuilder (231bd0c8-b3f8-4eb8-8c25-2eb62ff87615)’ resolved as dependency of  
> component ‘Litium.Accelerator.Services. **ProductConfigurationService** (50325535-9e93-445c-b675-5921e7f87515)’ resolved as dependency of  
> component ‘Litium.Products.PriceCalculator.IPriceCalculator (c416221c-5590-4300-95f0-cd4345c8dec9)’ resolved as dependency of  
> component ‘Litium.Web.Models.Products.ProductPriceModelBuilder (231bd0c8-b3f8-4eb8-8c25-2eb62ff87615)’ resolved as dependency of  
> component ‘Litium.Accelerator.Builders.Product.ProductItemViewModelBuilder (3f1cd84f-a40a-4042-9d10-32c5c89f0533)’ resolved as dependency of  
> component ‘Litium.Accelerator.Builders.Block.ProductBlockViewModelBuilder (424afdd9-2fde-4f34-b6c9-b7f46d0b467f)’ resolved as dependency of  
> component ‘system.web.mvc.icontroller(litium.accelerator.mvc.controllers.blocks.productblockcontroller)’ which is the root component being resolved.

`ProductConfigurationService` is our custom service.

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<div class="post-metadata">

**Author:** ![utku](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/utku/32/62_2.png) [@utku](https://forum.litium.com/u/utku)\
**Post date:** [August 26, 2021, 11:38am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/5 "2021-08-26T11:38:07Z")

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Do you have a custom PriceCaclculator imlementation refering to ProductConfigurationService?

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**Author:** ![kdxperbol](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/kdxperbol/32/513_2.png) [@kdxperbol](https://forum.litium.com/u/kdxperbol)\
**Post date:** [August 26, 2021, 11:39am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/6 "2021-08-26T11:39:37Z")

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Yes, sorry, after actually reading the cyclomatic chain, I realize that our custom code is involved in this problem.

But, either way, are you saying the solution to getting the “current” price is to use the `ProductPriceModelBuilder`?

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**Author:** ![utku](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/utku/32/62_2.png) [@utku](https://forum.litium.com/u/utku)\
**Post date:** [August 26, 2021, 12:19pm UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/7 "2021-08-26T12:19:56Z")

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Yes or implement the logic of ProductPriceModelBuilder 🙂 It uses the price and campaign calculators to get the current price.

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**Author:** ![kdxperbol](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/kdxperbol/32/513_2.png) [@kdxperbol](https://forum.litium.com/u/kdxperbol)\
**Post date:** [August 26, 2021, 7:10pm UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/8 "2021-08-26T19:10:30Z")

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I’m having some trouble wrapping my head around this.

I can’t add a `ProductPriceModelBuilder` to my custom `IPriceCalculator`, since it creates a cyclic dependency.

Neither can I add an `ICampaignPriceCalculator` to my custom `IPriceCalculator`, for the same reason.

The problem is that my custom `IPriceCalculator` needs to know the price of a _different_ product in order to do its calculation, and not just the list price.

Is there any way I could use a `ProductPriceModelBuilder` from my `IPriceCalculator`?

Or is there something else I can decorate (higher up the chain?) to alter the price calculation where I can use a `ProductPriceModelBuilder`?

Or if I implement a custom `ProductPriceModelBuilder` (if possible), would it automatically be used the same way an `IPriceCalculator` would?

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**Author:** ![patric.forsgard](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/patric.forsgard/32/10_2.png) [@patric.forsgard](https://forum.litium.com/u/patric.forsgard)\
**Post date:** [August 27, 2021, 7:14am UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/9 "2021-08-27T07:14:36Z")

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It’s dependent on where you need to the prices to be visible.

The implementation of `ICampaignPriceCalculator` is using the `IPriceCalculator` to fetch the list price for the product when calculating the discounted price. `ICampaignPriceCalculator` cant be used in `IPriceCalculator` because of circular reference.

The implementation of `ProductPriceModelBuilder` is using both the `ICampaignCalculator` and `IPriceCalculator` to be able to calculate the correct price for the product for the visitor. The `ProductPriceModelBuilder` cant be used in the implementation of these services because of the circular reference.

`ProductPriceModelBuilder` is used in the Accelerator to build the price model, this including list price, tier prices and discounted price (campaign price).

We also have other items in the product that calculating the price, example the price agent feed that only using the `ICampaignCalculator` and `IPriceCalculator`.

If I understand correctly what you want to do is to calculate both the unit price and the discounted price, then you need to override both the `IPriceCalculator` to get the calculated unit price and `ICampaignPriceCalculator` if there is any special calculations that need to be done when the discounted price should be calculated.

I think you should do something like these in in a `IPriceCalculator` decorator implementation

```cs
        public IDictionary<Guid, PriceCalculatorResult> GetListPrices([NotNull] PriceCalculatorArgs calculatorArgs, [NotNull] params PriceCalculatorItemArgs[] itemArgs)
        {
            return itemArgs.ToDictionary(x => x.VariantSystemId, x =>
            {
                var variantsToFetchPricesFor = GetVariantsToUseForPriceLookup(x);

                var result = _parentResolver.GetListPrices(calculatorArgs, variantsToFetchPricesFor.ToArray());
                return new PriceCalculatorResult
                {
                    ListPrice = result.Sum(x => x.Value.ListPrice),
                    ListPriceWithVat = result.Sum(x => x.Value.ListPriceWithVat),
                    VatPercentage = result.Select(x => x.Value.VatPercentage).FirstOrDefault(),
                };
            });
        }

        IEnumerable<PriceCalculatorItemArgs> GetVariantsToUseForPriceLookup(PriceCalculatorItemArgs item)
        {
            // get all the other variants that should be included for price calculation and return PriceCalculatorItemArgs for them
            yield return new PriceCalculatorItemArgs
            {
                Quantity = item.Quantity,
                VariantSystemId = item.VariantSystemId
            };
        }

```

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<div class="post-metadata">

**Author:** ![kdxperbol](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/kdxperbol/32/513_2.png) [@kdxperbol](https://forum.litium.com/u/kdxperbol)\
**Post date:** [August 30, 2021, 8:04pm UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/10 "2021-08-30T20:04:27Z")

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Thank you for this detailed explanation. We’ll have to consider how best to approach this.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/litium/original/1X/12eddac3b8b661de1db86af10ac8151b571e6fb9.png) [@system](https://forum.litium.com/u/system)\
**Post date:** [September 27, 2021, 8:04pm UTC](https://forum.litium.com/t/get-campaign-price-for-different-variant-inside-custom-price-calculation/2188/11 "2021-09-27T20:04:29Z")

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Closed on September 27, 2021, 8:04pm UTC

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