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# E306

# Expression is Not a Boolean

## Erroneous Code Example

This error occurs when an expression is expected to result in a boolean value but produces a different type.

<CodeGroup>
  ```helixql queries.hx theme={null}
  QUERY getUsers() =>
      users <- N<User>::WHERE(|u| u.name)
      RETURN users
  ```

  ```helixql schema.hx theme={null}
  N::User {
      name: String,
      active: Bool,
  }
  ```
</CodeGroup>

## Solution

Ensure the expression evaluates to a boolean value.

<CodeGroup>
  ```helixql queries.hx theme={null}
  QUERY getUsers() =>
      users <- N<User>::WHERE(|u| u.active == true)
      RETURN users
  ```

  ```helixql schema.hx theme={null}
  N::User {
      name: String,
      active: Bool,
  }
  ```
</CodeGroup>