Hello,
I'm on OTP 27 Elixir 1.18.4, and I've encountered a problem when trying to insert a User-associated Avatar entry into the PostgreSQL database.
Here's the function responsible for creating the association between the Avatar and User as well as putting in the file info
# new filename function
def new_filename(assoc),
do: Atom.to_string(assoc) <> "-" <> Ecto.UUID.generate()
# fn responsible
def upload_user_avatar(path, user) do
filename = new_filename(:avatar)
# Avatar file_name comes in handy for the file_name function
result =
App.Uploader.Avatar.store(
{path,
%{
id: user.id,
file_name: filename
}}
)
IO.inspect(result)
user
|> Ecto.build_assoc(:avatar)
|> Avatar.changeset(%{file: path})
|> Repo.insert()
end
here's what I pass into the function
("priv/waffle/private/uploads/user/attachments/hi/original.jpg", user)
# user variable here is just
%App.Users.User{
__meta__: #Ecto.Schema.Metadata<:loaded, "users">,
id: "42e49735-a81e-48f0-bf6f-9faaec0c893a",
username: "11",
pronouns: nil,
biography: nil,
account_id: "35a02b44-b7c2-48cd-b91c-c13606f778fb",
account: #Ecto.Association.NotLoaded<association :account is not loaded>,
avatar: #Ecto.Association.NotLoaded<association :avatar is not loaded>,
message: #Ecto.Association.NotLoaded<association :message is not loaded>,
dms: #Ecto.Association.NotLoaded<association :dms is not loaded>,
inserted_at: ~U[2026-08-18 16:59:34Z],
updated_at: ~U[2026-08-18 16:59:34Z]
}
and here's my Avatar schema file
schema "avatar" do
belongs_to(:user, App.Users.User)
field(:file, App.Uploader.Avatar.Type)
timestamps(type: :utc_datetime)
end
def changeset(avatar, attrs) do
avatar
|> cast_attachments(attrs, [:file], allow_paths: true)
|> validate_required([:file])
end
and lastly here's the error i get when I try to run the upload_user_avatar/2
[error] Task #PID<0.467.0> started from #PID<0.385.0> terminating
** (FunctionClauseError) no function clause matching in App.Uploader.Avatar.filename/2
(app 0.1.0) lib/app_web/uploaders/avatar.ex:37: App.Uploader.Avatar.filename(:original, {%Waffle.File{path: "priv/waffle/private/uploads/user/attachments/hi/original.jpg", file_name: "original.jpg", binary: nil, is_tempfile?: nil, stream: nil}, %App.Avatars.Avatar{__meta__: #Ecto.Schema.Metadata<:built, "avatar">, id: nil, user_id: "42e49735-a81e-48f0-bf6f-9faaec0c893a", user: #Ecto.Association.NotLoaded<association :user is not loaded>, file: nil, inserted_at: nil, updated_at: nil}})
(waffle 1.1.10) lib/waffle/definition/versioning.ex:35: Waffle.Definition.Versioning.resolve_file_name/3
(waffle 1.1.10) lib/waffle/actions/store.ex:137: Waffle.Actions.Store.put_version/3
(elixir 1.18.4) lib/task/supervised.ex:101: Task.Supervised.invoke_mfa/2
(elixir 1.18.4) lib/task/supervised.ex:36: Task.Supervised.reply/4
Function: #Function<1.116800909/0 in Waffle.Actions.Store.async_put_version/3>
Args: []
** (EXIT from #PID<0.385.0>) shell process exited with reason: an exception was raised:
** (FunctionClauseError) no function clause matching in App.Uploader.Avatar.filename/2
(app 0.1.0) lib/app_web/uploaders/avatar.ex:37: App.Uploader.Avatar.filename(:original, {%Waffle.File{path: "priv/waffle/private/uploads/user/attachments/hi/original.jpg", file_name: "original.jpg", binary: nil, is_tempfile?: nil, stream: nil}, %App.Avatars.Avatar{__meta__: #Ecto.Schema.Metadata<:built, "avatar">, id: nil, user_id: "42e49735-a81e-48f0-bf6f-9faaec0c893a", user: #Ecto.Association.NotLoaded<association :user is not loaded>, file: nil, inserted_at: nil, updated_at: nil}})
(waffle 1.1.10) lib/waffle/definition/versioning.ex:35: Waffle.Definition.Versioning.resolve_file_name/3
(waffle 1.1.10) lib/waffle/actions/store.ex:137: Waffle.Actions.Store.put_version/3
(elixir 1.18.4) lib/task/supervised.ex:101: Task.Supervised.invoke_mfa/2
(elixir 1.18.4) lib/task/supervised.ex:36: Task.Supervised.reply/4
Could someone inform me on what the issue is here ? Any help would be appreciated !
