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I’m trying to work out if there’s a nicer way (i.e. more clever) of using lens-aeson to set a key based on the value of another key.
I have a YAML structure like this:
yaml' :: Value yaml' = [yamlQQ| - panda: x-image: panda - goat: x-image: goat |]
that I want to transform into this:
yaml' :: Value yaml' = [yamlQQ| - panda: image: panda:latest x-image: pada - goat: image: goat:latest x-image: goat |]
That is, I want to add/set the value of image based on the value of x-image of the same object.
image
x-image
The way I came up with was to write a helper function
foo o = o & _Object . at "image" ?~ String (iN <> ":latest") where iN = o ^. key "x-image" . _String
and using that I can do what I want:
λ> yaml' & values . members %~ foo Array [Object (fromList [("panda",Object (fromList [("image",String "panda:latest"),("x-image",String "panda")]))]),Object (fromList [("goat",Object (fromList [("image",String "goat:latest"),("x-image",String "goat")]))])]
Is there another, nicer way of doing this?
Would you consider this nicer?
yaml' & values . members . _Object %~ (set (at "image") . (_Just . _String %~ (<> ":latest")) =<< view (at "x-image"))
Hmm, maybe slightly. I have to admit I was hoping I'd missed a function that perfectly fit my need though :sweat_smile:
I’m trying to work out if there’s a nicer way (i.e. more clever) of using lens-aeson to set a key based on the value of another key.
I have a YAML structure like this:
that I want to transform into this:
That is, I want to add/set the value of
imagebased on the value ofx-imageof the same object.The way I came up with was to write a helper function
and using that I can do what I want:
Is there another, nicer way of doing this?
Would you consider this nicer?
Hmm, maybe slightly. I have to admit I was hoping I'd missed a function that perfectly fit my need though :sweat_smile: