mobilizon/lib/mobilizon/actors/follower.ex

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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
alias Mobilizon.Web.Endpoint
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@type t :: %__MODULE__{
id: String.t(),
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approved: boolean,
url: String.t(),
target_actor: Actor.t(),
actor: Actor.t(),
notify: boolean(),
inserted_at: DateTime.t(),
updated_at: DateTime.t()
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}
@required_attrs [:url, :approved, :target_actor_id, :actor_id]
@optional_attrs [:notify]
@attrs @required_attrs ++ @optional_attrs
@timestamps_opts [type: :utc_datetime]
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@primary_key {:id, :binary_id, autogenerate: true}
schema "followers" do
field(:approved, :boolean, default: false)
field(:url, :string)
field(:notify, :boolean, default: true)
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timestamps()
belongs_to(:target_actor, Actor)
belongs_to(:actor, Actor)
end
@doc false
@spec changeset(follower :: t | Ecto.Schema.t(), attrs :: 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, "#{Endpoint.url()}/follow/#{uuid}")
end
end