I have defined these types of records for modelling a simple shopping cart:
; An item in the cart
(defrecord Item [id name product quantity purchased])
; The product that relates to the item in the cart
(defrecord Product [id name description prices])
; A price definition
(defrecord Price [price tax-rate currency])
; Sample items
(def items [
(->Item 1 "Brogues" "P-123" 1 true)
(->Item 2 "Underpants" "P-345" 1 false)
(->Item 3 "Shirt" "P-678" 1 true)
])
; Sample products
(def products [
(->Product "P-123" "Brogues" "Men's Leather Slip on
Brogues" (->Price 93.00 21 "EURO"))
(->Product "P-345" "Underpants" "CK Y Fronts" (->Price
23.50 21 "EURO"))
(->Product "P-678" "Shirt" "Slim Fit White Vest Shirt"
(->Price 45.99 21 "EURO"))
(->Product "P-1231" "Table" "Coffee Table" (->Price 375 21
"EURO"))
(->Product "P-3451" "Chairs" "Set of Four(4) chairs"
(->Price 200 21 "EURO"))
(->Product "P-6781" "TableCloth" "Classic red and white
checks 2m x 2m" (->Price 17.99 21 "EURO"))
])
My requirement is to combine data from the two collections such that I can
show the detailed product information for any item, for example:
(->Item 3 "Shirt" "Slim Fit White Vest Shirt" (->Price 45.99
21 "EURO") 1 true)
When I tried to use merge-with union I had an error which surprised me
since I thought records are also maps:
user=> (merge-with union items products)
ClassCastException user.Product cannot be cast to java.util.Map$Entry
clojure.core/key (core.clj:1465)
Although I will fight on, any tips from any of you that have done this
before would be greatly helped.
Thanks
ray
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