phoenix pass variable to view

问题

i have a query result that will be used in view, but when i call the variable in view, i got undefined function data/0 (because data is not function)

i already pass data with different way, map, etc

controller.ex :

def new(conn, _params) do
    data =
        Enum.map(
          from(AccountTypeSchema)
          |> Repo.all(),
          fn elem ->
            elem |> Map.from_struct() |> Map.delete(:__meta__)
          end
        )
    render(conn, "new.html", data: data)
end

view.html.eex :

<% Enum.each data, fn(item) -> %>
    <option value="us">Facebook</option>
<% end %>

call data variable from view

回答1:

Use this code instead:

render(conn, "new.html", account_types: data)

Then in view:

<% Enum.each @account_types, fn(item) -> %>
  <option value="us">Facebook</option>
<% end %>

Generally you have @ prefixed variables available in template when you pass keyword list or map to a view: https://hexdocs.pm/phoenix/Phoenix.View.html#render/3

回答2:

Enum.map/2 returns a list (I took a responsibility to rewrite the code in more idiomatic way):

data =
  AccountTypeSchema
  |> Repo.all()
  |> Enum.map(& &1 |> Map.from_struct() |> Map.delete(:__meta__))

Obviously one cannot access list by key; pass a keyword instead:

render(conn, "new.html", data: data)

来源：https://stackoverflow.com/questions/53940549/phoenix-pass-variable-to-view