Fixing for_each errors

In Chapter 3, Scaling Your Infrastructure with Terraform, in the Looping over object collections recipe, we learned how to use the for_each expression to loop over collections.

Now, regarding for_each errors, potential issues related to for_each can include:

• Missing Key in the Input Data Structure: If the data structure used with for_each is empty or does not contain the expected keys or elements, Terraform may raise an error. For example, if you attempt to use for_each with an empty map or set, Terraform won’t be able to create any instances, resulting in an error.
• Duplicate Keys in the Input Data Structure: for_each expects unique keys in the input data structure to create distinct resource instances. If there are duplicate keys, Terraform will raise an error because resource instances must have unique identifiers.
• Data Type Mismatch: The data structure used with for_each must be compatible with the resource or module block...