If loop to ignore null value for conditional checks - if-statement

Question

locals {
acl_out = flatten([
for opi, clsan in var.appr : [
for co, coo in clsan : [
for applo in coo : [
for op in ( co == "RO" ? ["READ","DESCRIBE"] : ["WRITE"]) : {
oper = op
appid_lo = applo
opic-name = opi
process = co
}
]
]
]
])
}
variable "appr" {
description = "A complex object "
type = map(object({
#displayname = string
RO = optional(list(string))
WO = optional(list(string))
}))
}
If co = RO then ["READ","DESCRIBE"]
If co = WO then [WRITE]
Above expression fails with null value, If WO not defined/unset in product 2, If statement need to corrected
Input :
Working
appr = {
product1 = { WO = ["6470"], RO = ["6471","5538"] },
product2 = { WO = ["5555"], RO = ["6472"]},
product3 = { WO = ["6473"], RO = ["6474"] },
}
Not Working
appr = {
product1 = { WO = ["6470"], RO = ["6471","5538"] },
product2 = { RO = ["6472"]},
product3 = { WO = ["6473"], RO = ["6474"] },
}
Error:
A null value cannot be used as the collection in a 'for' expression.
Tried this way also fails
for op in ( co == "RO" = ["READ","DESCRIBE"] || co == "WO" = ["WRITE"] ) : {
Desired Result :
{
opic-name = "product1"
oper = "WRITE"
appid_lo = 6470
},
{
opic-name = "product1"
oper = "READ"
appid_lo = 6471
},
{
opic-name = "product1"
oper = "DESCRIBE"
appid_lo = 6471
}
and so on

Answer 1

This question was a fun one!
Check if it is null before running the next for
locals {
acl_out = flatten([
for opi, clsan in var.appr : [
for co, coo in clsan : [
coo == null ? [] : [
for applo in coo : [
for op in ( co == "RO" ? ["READ","DESCRIBE"] : ["WRITE"]) : {
oper = op
appid_lo = applo
opic-name = opi
process = co
}
]
]]
]
])
}
Output for acl_out
acl_out = [
+ {
+ appid_lo = "6471"
+ oper = "READ"
+ opic-name = "product1"
+ process = "RO"
},
+ {
+ appid_lo = "6471"
+ oper = "DESCRIBE"
+ opic-name = "product1"
+ process = "RO"
},
+ {
+ appid_lo = "5538"
+ oper = "READ"
+ opic-name = "product1"
+ process = "RO"
},
+ {
+ appid_lo = "5538"
+ oper = "DESCRIBE"
+ opic-name = "product1"
+ process = "RO"
},
+ {
+ appid_lo = "6470"
+ oper = "WRITE"
+ opic-name = "product1"
+ process = "WO"
},
+ {
+ appid_lo = "6472"
+ oper = "READ"
+ opic-name = "product2"
+ process = "RO"
},
+ {
+ appid_lo = "6472"
+ oper = "DESCRIBE"
+ opic-name = "product2"
+ process = "RO"
},
+ {
+ appid_lo = "6474"
+ oper = "READ"
+ opic-name = "product3"
+ process = "RO"
},
+ {
+ appid_lo = "6474"
+ oper = "DESCRIBE"
+ opic-name = "product3"
+ process = "RO"
},
+ {
+ appid_lo = "6473"
+ oper = "WRITE"
+ opic-name = "product3"
+ process = "WO"
},
]
Cheers!