Azure Bicep: setting a null value if the property doesn't exist - azure

Question

I am deploying schedules for the azure update management service through bicep. My code is as below:
param parSchedules array = [
{
name: 'mysched1'
monthlyOccurrencesDay: null
monthlyOccurrencesOccurence: null
DaysOfWeek: 'Wednesday'
StartTime: '${parBaseTimeForUpdateSchedules}T19:00:00'
tag: {
Update: [
'tag1'
]
}
}
{
name: 'mysched2'
monthlyOccurrencesDay: 'Wednesday'
monthlyOccurrencesOccurence: 1
DaysOfWeek: 'Wednesday'
StartTime: '${parBaseTimeForUpdateSchedules}T07:00:00'
tag: {
Update: [
'tag2'
]
}
}
]
resource resUpdateschedule 'Microsoft.Automation/automationAccounts/softwareUpdateConfigurations#2019-06-01' = [for schedule in parSchedules: {
name: schedule.name
parent: resAutomationAccount
properties: {
scheduleInfo: {
advancedSchedule: {
monthlyOccurrences: [
{
day: schedule.monthlyOccurrencesDay
occurrence: schedule.monthlyOccurrencesOccurence
}
]
weekDays: [
schedule.DaysOfWeek
]
}
description: ''
frequency: 'Week'
interval: 1
isEnabled: true
startTime: schedule.StartTime
timeZone: 'UTC'
}
updateConfiguration: {
duration: 'PT2H'
operatingSystem: 'Windows'
targets: {
azureQueries: [
{
locations: [
parLocation
]
scope: [
subscription().id
]
tagSettings: {
tags: schedule.tag
}
}
]
}
windows: {
includedUpdateClassifications: 'Critical, Security'
rebootSetting: 'IfRequired'
}
}
}
}]
I am getting error with this because null value is not accepted for monthlyOccurrencesDay and monthlyOccurrencesOccurence. So what I want is to be able to use the same list containing different types of schedules (with and without monthlyOccurrencesOccurence) by looping the same resource. Like if the values of monthlyOccurrencesOccurence is null, it shouldn't take into consideration this property. Is that possible at all?

Answer 1

You should be able to conditionally set the monthly occurence like that:
resource resUpdateschedule 'Microsoft.Automation/automationAccounts/softwareUpdateConfigurations#2019-06-01' = [for schedule in parSchedules: {
name: schedule.name
...
properties: {
scheduleInfo: {
advancedSchedule: {
monthlyOccurrences: schedule.monthlyOccurrencesOccurence != null ? [
{
day: schedule.monthlyOccurrencesDay
occurrence: schedule.monthlyOccurrencesOccurence
}
] : []
...
}
...
}
...
}
}]