Remove and return an element from the index in the array
key
is key to modify.
index
is position in the array to start popping from. Default is -1, meaning the last element. Out-of-range indexes round to their respective array ends. Popping an empty array returns null.
path
is JSONPath to specify. Default is root $.
JSON.ARRPOP returns an array of bulk string replies for each path, each reply is the popped JSON value, or nil, if the matching JSON value is not an array.
For more information about replies, see Redis serialization protocol specification.
Pop a value from an index and insert a new value
Create two headphone products with maximum sound levels.
{{< highlight bash >}} redis> JSON.SET key $ '[{"name":"Healthy headphones","description":"Wireless Bluetooth headphones with noise-cancelling technology","connection":{"wireless":true,"type":"Bluetooth"},"price":99.98,"stock":25,"colors":["black","silver"],"max_level":[60,70,80]},{"name":"Noisy headphones","description":"Wireless Bluetooth headphones with noise-cancelling technology","connection":{"wireless":true,"type":"Bluetooth"},"price":99.98,"stock":25,"colors":["black","silver"],"max_level":[80,90,100,120]}]' OK {{< / highlight >}}
Get all maximum values for the second product.
{{< highlight bash >}} redis> JSON.GET key $.[1].max_level "[[80,90,100,120]]" {{< / highlight >}}
Update the max_level field of the product: remove an unavailable value and add a newly available value.
{{< highlight bash >}} redis> JSON.ARRPOP key $.[1].max_level 0
- "80" {{< / highlight >}}
Get the updated array.
{{< highlight bash >}} redis> JSON.GET key $.[1].max_level "[[90,100,120]]" {{< / highlight >}}
Now insert a new lowest value.
{{< highlight bash >}} redis> JSON.ARRINSERT key $.[1].max_level 0 85
- (integer) 4 {{< / highlight >}}
Get the updated array.
{{< highlight bash >}} redis> JSON.GET key $.[1].max_level "[[85,90,100,120]]" {{< / highlight >}}
JSON.ARRAPPEND | JSON.ARRINDEX