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Support conditional PUT #11

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Support conditional PUT #11

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13 changes: 11 additions & 2 deletions src/rotary/client.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
DescribeTableResult
DeleteTableRequest
DeleteItemRequest
ExpectedAttributeValue
GetItemRequest
GetItemResult
Key
Expand Down Expand Up @@ -178,14 +179,22 @@
(as-map [result]
(item-map (.getItem result))))

(defn- expected-value [req expected]
(when expected
(.setExpected req (fmap #(if (instance? Boolean %)
(ExpectedAttributeValue. %)
(ExpectedAttributeValue. (to-attr-value %)))
expected))))

(defn put-item
"Add an item (a Clojure map) to a DynamoDB table."
[cred table item]
[cred table item & {:keys [expected]}]
(.putItem
(db-client cred)
(doto (PutItemRequest.)
(.setTableName table)
(.setItem (fmap to-attr-value item)))))
(.setItem (fmap to-attr-value item))
(expected-value expected))))

(defn- item-key
"Create a Key object from a value."
Expand Down