debianize-mobilizon/lib/mobilizon/events/participant.ex

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defmodule Mobilizon.Events.Participant do
@moduledoc """
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Represents a participant, an actor participating to an event.
"""
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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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alias Mobilizon.Config
alias Mobilizon.Events
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alias Mobilizon.Events.{Event, ParticipantRole}
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@type t :: %__MODULE__{
role: ParticipantRole.t(),
url: String.t(),
event: Event.t(),
actor: Actor.t()
}
@required_attrs [:url, :role, :event_id, :actor_id]
@attrs @required_attrs
@primary_key {:id, :binary_id, autogenerate: true}
schema "participants" do
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field(:role, ParticipantRole, default: :participant)
field(:url, :string)
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belongs_to(:event, Event, primary_key: true)
belongs_to(:actor, Actor, primary_key: true)
timestamps()
end
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@doc """
We check that the actor asking to leave the event is not it's only organizer.
We start by fetching the list of organizers and if there's only one of them
and that it's the actor requesting leaving the event we return true.
"""
@spec is_not_only_organizer(integer | String.t(), integer | String.t()) :: boolean
def is_not_only_organizer(event_id, actor_id) do
case Events.list_organizers_participants_for_event(event_id) do
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[%__MODULE__{actor: %Actor{id: participant_actor_id}}] ->
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participant_actor_id == actor_id
_ ->
false
end
end
@doc false
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@spec changeset(t, map) :: Ecto.Changeset.t()
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def changeset(%__MODULE__{} = participant, attrs) do
participant
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|> cast(attrs, @attrs)
|> ensure_url()
|> validate_required(@required_attrs)
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()
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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 ->
update_url(changeset)
end
end
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defp ensure_url(%Ecto.Changeset{} = changeset), do: changeset
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defp update_url(%Ecto.Changeset{} = changeset) do
uuid = Ecto.UUID.generate()
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url = generate_url(uuid)
changeset
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|> put_change(:id, uuid)
|> put_change(:url, url)
end
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@spec generate_url(String.t()) :: String.t()
defp generate_url(uuid), do: "#{Config.instance_hostname()}/join/event/#{uuid}"
end