Terraform cant access attributes on a list of objects.

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. After some digging I found that the above PR appeared to change what types of elements could be accessed from lists, however, there was no reference in the PR or the changelog about the change in the element function or it appears any of the functions that take a list type only working with flat lists. Was this intended? I tried to do some workarounds, but it appeared that anything that I tried to use that took a type of list did not like the fact that it was not a flat list.

Terraform cant access attributes on a list of objects.

Terraform provides a greater ability to define Infrastructure as Code IaC through its support of Expressions. Expressions are lines of code that define configuration and attributes on resources in the Terraform HCL code as the Terraform code is executed with the terraform plan command. This enables a rich ability to dynamically configure resources based on passed input variables to the Terraform Project , or even via looking up other resources managed by the same Terraform Project. There is a huge variety to the different code expressions that can be written in Terraform to suit the requirements of different Infrastructure as Code projects. Terraform expressions support many built-in functions to help writing the expression code needed for a solutions infrastructure definition. When using a Terraform list type to define an Array of value or objects, it may be necessary at times to lookup those values programmatically. The Terraform index function can be used to lookup the index location of a value in a list. The function accepts an argument that is a reference to the list to search, and an argument that is the value to lookup the index for within the list. The following is an example usage of the index function to find the index of a value in a simple list of string values:. The previous example shows how simple it is to use the index function to retrieve the index of a value within a list of strings aka list string. This can be used exactly the same way to lookup the index of values in a list of numbers aka list number too. The following is an example usage of the index function to find the index of a value in a simple list of numbers:.

The following is an example usage of the index function to find the index of a value in a simple list of string values:.

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Hands-on: Try the Create Dynamic Expressions tutorial. Terraform makes several kinds of named values available. Each of these names is an expression that references the associated value. You can use them as standalone expressions, or combine them with other expressions to compute new values. The main kinds of named values available in Terraform are:. The sections below explain each kind of named value in detail. Although many of these names use dot-separated paths that resemble attribute notation for elements of object values, they are not implemented as real objects. Any named value that does not match another pattern listed below will be interpreted by Terraform as a reference to a managed resource. For more information about how to use resource references, see references to resource attributes below.

Terraform cant access attributes on a list of objects.

Terraform is a powerful tool for managing infrastructure, but it can sometimes be tricky to get the hang of. One common problem that Terraform users encounter is not being able to access attributes on a list of objects. Terraform is a tool for building, changing, and versioning infrastructure.

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The following is an example of using a splat lookup on a list of objects to lookup the index of the object in the list with the name attribute set to the value being looked up:. Example of the error: data. When using a Terraform list type to define an Array of value or objects, it may be necessary at times to lookup those values programmatically. Type your email… Subscribe. Prior versions of Terraform actually had some quite surprising behavior in this scenario - a splat reference to an attribute of list type would concatenate all the lists in the result. Copy link. The function accepts an argument that is a reference to the list to search, and an argument that is the value to lookup the index for within the list. We use cookies to improve your browsing experience. Notifications Fork 9. This happens to work if your list attributes happen to only have one element, but it causes some very unexpected behavior in most other cases. Was this intended? Notifications Fork 8. Indexing of computed lists does not work

Terraform provides a greater ability to define Infrastructure as Code IaC through its support of Expressions. Expressions are lines of code that define configuration and attributes on resources in the Terraform HCL code as the Terraform code is executed with the terraform plan command.

After some digging I found that the above PR appeared to change what types of elements could be accessed from lists, however, there was no reference in the PR or the changelog about the change in the element function or it appears any of the functions that take a list type only working with flat lists. Sign in to your account. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Copy link. DustinChaloupka commented Aug 3, You switched accounts on another tab or window. I have used this datasource to gather data from the cluster and was encountering an error related to this datasource:. Let me know if you have any further questions. Already on GitHub? I have been able to recreate this, we are currently looking into it now to see what we can do. The scenario that does not work, however, is when the resource has not yet been created and the list attribute has not been explicitly defined:. Labels documentation Introduces or discusses updates to documentation.