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:. There are also times when the list may contain objects that have their own attributes. To use the index function on a list of objects list object to find the index of an object in the list by looking up the value of an attribute on the object is performed with the help of a splat expression that that converts the list object to a list of the values needed for the lookup. 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:.

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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.

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. One of the things that makes Terraform so powerful is its ability to work with lists of objects. For example, you can create a list of AWS instances, and then use Terraform to apply changes to all of the instances in the list. However, there are a few things that can go wrong when you try to access attributes on a list of objects in Terraform. In this guide, we will discuss some of the most common problems that you might encounter, and how to fix them.

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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. I am also seeing this issue described in comment. Remote terraform state stale Type your email…. You signed out in another tab or window. Continue reading. OmarDarwish mentioned this issue Nov 28, Note that "this isn't currently supported" is fine since it seems like the previous behavior was not explicitly supported at which point this could be a feature rather than a bug. The new square bracket indexing syntax does not have this limitation, so that's the way you can properly express this scenario in your config:. Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

For quite some time, I've been waiting for a particular feature to exit beta and this is the optional object type attribute. The Optional Object type attribute, was in beta for quite some time since Terraform 0. When you are building a generic module and you want to offer a lot of possibilities for the people that are going to use it, you will use objects.

Please see our prioritization guide for information on how we prioritize. Sign in to your account. Flattening a list in 0. New issue. Jump to bottom. Copy link. You signed in with another tab or window. The type system within HashiCorp's interpolation language has not yet been enhanced to support functions with multiple possible return types, which is why interpolation functions like element and lookup carry with them a limitation that they must return a string. The new square bracket indexing syntax does not have this limitation, so that's the way you can properly express this scenario in your config:. Also, just as Arrays in most other programming languages start with an index of zero 0 for the first element in the Array, so is the list type in Terraform. Related Articles. Copy link. Let me know if you have any further questions.