Terraform: Iterate over keys in JSON file - json

Question

Using Terraform I need to loop over some JSON and create some files.
This is the file I'm reading in:
{
"files": {
"file1": {
"a": {
"unusedValue": "val"
}
},
"file2": {
"a": {
"unusedValue": "val"
},
"b": {
"unusedValue": "val"
}
}
}
}
I can't change the format of this file, I need to use to create 3 files:
file1a
file2a
file2b
At the minute, I've got this:
locals {
json = jsondecode(file("files.json"))
files = flatten([ for v in local.json.files:
[ for file, fileLetter in v:
{ "file" = file,
"fileLetter" = fileLetter}
]
])
}
# resource local_file file {
# for_each = { for idx, v in local.files: idx => v }
# content = "Temp content"
# filename = "${path.module}/${each.value.file}-${each.value.fileLetter}"
#}
output myout {
value = local.files
}
But it's giving the wrong output - it's taking the contents of the second object rather than it's name and the first bit isn't using the fileA, fileB, etc.
[
+ {
+ file = "a"
+ fileLetter = {
+ unusedValue = "val"
}
},
+ {
+ file = "a"
+ fileLetter = {
+ unusedValue = "val"
}
},
+ {
+ file = "b"
+ fileLetter = {
+ unusedValue = "val"
}
},
]
It should be:
[
+ {
+ file = "file1"
+ fileLetter = "a"
},
+ {
+ file = "file2",
+ fileLetter = "a"
},
+ {
+ file = "file2",
+ fileLetter = "b"
},
]

Answer 1

I think this should work:
files = flatten([ for file, fileObject in local.json.files:
[ for fileLetter, _ in fileObject:
{ "file" = file,
"fileLetter" = fileLetter}
]
])
With the original for v in local.json.files, you're iterating over only the inner objects, e.g.
{
"a": {
"unusedValue": "val"
}
}
Instead, you want to read both the key and the value from the JSON object in files. This can be done by using two temporary variables, file, fileObject. This is the same syntax you originally used in your file, fileLetter.