Pipelet UpdateProductVariationSelections
The purpose of this pipelet is to process variation value selections, and calculate and return the ProductVariationModels for one or multiple products. The pipelet uses the HttpParameterMap stored in the pipeline dictionary under the key "CurrentHttpParameterMap" and so the request parameters do not have to be passed in. Variation value selections must be specified as HTTP parameters in the following form: "{prefix_}{pid}_varAttrID={varAttrValueID}". A custom prefix can be set using the "CustomPrefix" parameter. Otherwise, the default prefix "dwvar_" is used. {pid} is the product id. Example: "dwvar_PN00050_color=red".

For each product specified as {pid}, a ProductVariationModel instance is created and returned as an element of the "ProductVariationModels" HashMap output parameter. The pipelet processes variation attributes in their defined order and ignores attributes or values not defined for a variation. The pipelet returns a map of ProductVariationModels with the product instance as the key and the ProductVariationModel as the value.

For backwards compatibility reasons, the pipelet accepts an optional Product instance as input parameter. The product may either be a master or a variant. If specified, the pipelet returns the ProductVariationModel for this product as "ProductVariationModel" and also as element of the "ProductVariationModels" HashMap parameter. Also, the system tries to find a variant which matches the attributes selected in the HttpParameterMap as closely as possible. The matching product is returned under the key "SelectedProduct". If the passed product is neither a master or a variant, then the product itself is simply returned under the key "SelectedProduct". No value will be set under the "SelectedProduct" key unless a Product instance was passed to the pipelet.

Input Parameters
Product  :  Product (Optional)
Optional master product or variant for which to process variation value selections. If nothing passed, then the system processes all HTTP request parameters in the current HttpParameterMap beginning with "dwvar_".
CustomFormPrefix  :  String (Optional)
Optional prefix for HTTP parameters. If nothing is passed, the default prefix "dwvar_" is assumed.
Output Parameters
ProductVariationModel  :  VariationModel  :  (Optional)
The variation model with updated variation attribute value selections.
SelectedProduct  :  Product  :  (Optional)
Deprecated: Selected variant or master. Will only be returned if optional Product is passed in as input parameter.
ProductVariationModels  :  Map  :  (Optional)
A map of updated ProductVariationModels with product as key.
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