debianize-mobilizon/lib/mobilizon/actors/follower.ex

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Elixir
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defmodule Mobilizon.Actors.Follower do
@moduledoc """
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Represents the following of an actor to another actor.
"""
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use Ecto.Schema
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import Ecto.Changeset
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alias Mobilizon.Actors.Actor
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@type t :: %__MODULE__{
approved: boolean,
url: String.t(),
target_actor: Actor.t(),
actor: Actor.t()
}
@required_attrs [:url, :approved, :target_actor_id, :actor_id]
@attrs @required_attrs
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@primary_key {:id, :binary_id, autogenerate: true}
schema "followers" do
field(:approved, :boolean, default: false)
field(:url, :string)
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belongs_to(:target_actor, Actor)
belongs_to(:actor, Actor)
end
@doc false
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@spec changeset(t, map) :: Ecto.Changeset.t()
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def changeset(follower, attrs) do
follower
|> cast(attrs, @attrs)
|> ensure_url()
|> validate_required(@required_attrs)
|> unique_constraint(:target_actor_id,
name: :followers_actor_target_actor_unique_index
)
end
# If there's a blank URL that's because we're doing the first insert
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@spec ensure_url(Ecto.Changeset.t()) :: Ecto.Changeset.t()
defp ensure_url(%Ecto.Changeset{data: %__MODULE__{url: nil}} = changeset) do
case fetch_change(changeset, :url) do
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{:ok, _url} ->
changeset
:error ->
generate_url(changeset)
end
end
# Most time just go with the given URL
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defp ensure_url(%Ecto.Changeset{} = changeset), do: changeset
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@spec generate_url(Ecto.Changeset.t()) :: Ecto.Changeset.t()
defp generate_url(%Ecto.Changeset{} = changeset) do
uuid = Ecto.UUID.generate()
changeset
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|> put_change(:id, uuid)
|> put_change(:url, "#{MobilizonWeb.Endpoint.url()}/follow/#{uuid}")
end
end