The TL;DR is that the initial selected value of an Ecto.Enum field seems to come through as a string when re-reselected in a dropdown.
So I have an enum field in my schema:
schema "transformations" do
# ...
field :name, Ecto.Enum, [:size_to_fill, :size_to_fit, ...], default: :size_to_fill
# ...
end
I set the options in my LiveView with something equivalent to this:
transformation_name_options =
MyApp.Context.transformation_names()
|> Enum.map(fn transformation_name ->
display_name =
transformation_name
|> Atom.to_string()
|> String.replace("_", " ")
|> String.capitalize()
{display_name, transformation_name}
end)
{:ok, assign(socket, :transformation_name_options, transformation_name_options)}
This is a nested one-to-many association so in my template I have:
def render(assigns) do
~H"""
<.inputs_for let={f_transformations} field={@form[:transformations]}>
<.input field={f_transformations[:name]} label="Name" type="select" options={@transformation_name_options} />
<%= case f_transformations[:name] do %>
<% :size_to_fill -> %>
<% # fields for :size_to_fill #>
<% # more matches on other transformations %>
<% end %>
</.inputs_for>
"""
end
It’s important to note that I can add additional transformations that all get this dropdown.
So the template loads normally with :size_to_fill as the default. I can then choose other transformations from the dropdown and they show their fields correctly. As soon as I try and select :size_to_fill again, I get an error that it can’t match on "size_to_fill", ie, the string version. If I save the form with a different transformation then build a new one, I now also error for the one that is now being loaded from the db. Does that makes sense? It’s a bit hard to explain. Basically any dropdown option that is initially loaded into the form works on first load but then is read as a string from then on when selected again.
Has anyone run into this? I can fix it by ensuring f_transformations[:name] is cast to an atom in the case statement, but it’s still strange. I’m prrrretty sure it’s nothing I’m doing as I’ve been over everything several times… but possibly.
Stuff:
erlang 26.0.2
elixir 1.14.5 (ya, I should really upgrade)
# ...
{:phoenix, "~> 1.7.2"},
{:phoenix_live_view, "~> 0.19"},
{:phoenix_html, "~> 3.3"},
{:phoenix_ecto, "~> 4.4"},
{:ecto_sql, "~> 3.10.1"},
# ...
