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40 lines
1 KiB
Elixir
40 lines
1 KiB
Elixir
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defmodule PhilomenaWeb.MapParameterPlug do
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# A bunch of crappy behaviors all interacting to create a
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# symphony of failure:
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#
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# 1.) Router helpers do not strip nil query parameters.
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# iex> Routes.gallery_path(conn, :index, gallery: nil)
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# "/galleries?gallery="
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#
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# 2.) Pagination always sets the parameter in the route in order
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# to preserve the query across multiple pages
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#
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# 3.) When received by the router, an empty param is treated as
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# an empty string instead of nil
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#
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# 4.) Phoenix.HTML.Form.form_for/2 raises an error if you try to
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# use it on a conn object which is a string instead of a map
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# (or nil)
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@spec init(Keyword.t()) :: Keyword.t()
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def init(opts) do
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opts
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end
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@spec call(Plug.Conn.t(), Keyword.t()) :: Plug.Conn.t()
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def call(conn, opts) do
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param = Keyword.fetch!(opts, :param)
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value = conn.params[param]
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cond do
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is_map(value) ->
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conn
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true ->
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params = Map.delete(conn.params, param)
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Map.put(conn, :params, params)
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end
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end
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end
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