terraform type_error ai_generated true

Error: Invalid attribute value: the given value is not suitable for attribute "tags": string values must not be null

ID: terraform/invalid-nullable-attribute

Also available as: JSON · Markdown · 中文
85%Fix Rate
85%Confidence
1Evidence
2024-02-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Terraform 1.3.0 active — — —
Terraform 1.4.0 active — — —
Terraform 1.5.0 active — — —

Root Cause

A resource attribute that expects a string or map of strings is receiving a null value, often from a conditional expression or variable that evaluates to null.

generic

中文

期望字符串或字符串映射的资源属性接收到了 null 值，通常来自条件表达式或求值为 null 的变量。

Official Documentation

https://developer.hashicorp.com/terraform/language/expressions/type-constraints

Workarounds

  1. 90% success Use the coalesce() function to provide a default non-null value when the variable is null. 
    Use the coalesce() function to provide a default non-null value when the variable is null.
  2. 85% success Use conditional logic with try() and type constraints to ensure null values are replaced. Alternatively, define the variable with a default non-null value. 
    Use conditional logic with try() and type constraints to ensure null values are replaced. Alternatively, define the variable with a default non-null value.
  3. 80% success If the attribute is optional and can be omitted, use a dynamic block or conditional to skip it entirely when the value is null. 
    If the attribute is optional and can be omitted, use a dynamic block or conditional to skip it entirely when the value is null.

中文步骤

  1. 使用 coalesce() 函数在变量为 null 时提供默认的非 null 值。
  2. 使用条件逻辑和 try() 结合类型约束确保 null 值被替换。或者，为变量定义默认的非 null 值。
  3. 如果属性是可选的并且可以省略，使用动态块或条件逻辑在值为 null 时完全跳过它。

Dead Ends

Common approaches that don't work:

  1. 60% fail

    Some AWS services reject empty strings for required tags. The provider may still throw an error if the service requires non-empty values.

  2. 85% fail

    If the attribute is required, Terraform will error with 'Required attribute is not set'. Removing it doesn't fix the null issue.

  3. 75% fail

    try() only catches errors, not null values. If the expression evaluates to null without error, try() returns null.