Ash.Changeset.add_error

You're seeing just the function add_error, go back to Ash.Changeset module for more information.
Link to this function

add_error(changeset, errors)

View Source

Specs

add_error(t(), term() | String.t() | [term() | String.t()]) :: t()

Adds an error to the changesets errors list, and marks the change as valid?: false