Replace terraform block with variable

Question

How do I replace an entire block of a terraform script with a variable? For example,

resource "azurerm_data_factory_trigger_schedule" "sfa-data-project-agg-pipeline-trigger" {
  name            = "aggregations_pipeline_trigger"
  data_factory_id = var.data_factory_resource_id
  pipeline_name   = "my-pipeline"

  frequency = var.frequency
  schedule {
    hours   = [var.adf_pipeline_schedule_hour]
    minutes = [var.adf_pipeline_schedule_minute]
  }
}

In the above sample, how to make the entire schedule block configurable using a terraform variable?

I tried this but it isn't working.

schedule = var.schedule

Marko E · Accepted Answer · 2022-06-27 18:52:48Z

7

Nope, that is not possible as schedule is a block with arguments and it is not an argument itself. Maps are aggregate types and and they are made of primitive types (e.g., numbers in this case). A more detailed explanation on primitive and aggregate types with examples can be found in [1] (h/t: Matt Schuchard). In such cases, I prefer to do something like this:

variable "schedule" {
  type = object({
    hours = number
    minutes = number
  })
  description = "Variable to define the values for hours and minutes."
  
  default = {
    hours = 0
    minutes = 0
  }
}

Then, in the resource:

resource "azurerm_data_factory_trigger_schedule" "sfa-data-project-agg-pipeline-trigger" {
  name            = "aggregations_pipeline_trigger"
  data_factory_id = var.data_factory_resource_id
  pipeline_name   = "my-pipeline"

  frequency = var.frequency
  schedule {
    hours   = [var.schedule.hours]
    minutes = [var.schedule.minutes]
  }
}

[1] https://www.terraform.io/plugin/sdkv2/schemas/schema-types#typemap

edited Jun 27, 2022 at 18:52

answered Jun 27, 2022 at 10:55

Marko E

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2 Comments

Matthew Schuchard Over a year ago

Could go even further with object({ hours = number, minutes = number }) type specification. The variable value already matches that, but the type specification is much broader at the moment. Also maybe mention why this is not possible because of the provider attribute schema type differences.

Marko E Over a year ago

Agreed, will fix it, thanks for the suggestion.

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