59 lines
1.3 KiB
Elixir
59 lines
1.3 KiB
Elixir
defmodule Eventos.Events.Tag.TitleSlug do
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alias Eventos.Events.Tag
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import Ecto.Query
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alias Eventos.Repo
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use EctoAutoslugField.Slug, from: :title, to: :slug
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def build_slug(sources, changeset) do
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slug = super(sources, changeset)
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build_unique_slug(slug, changeset)
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end
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defp build_unique_slug(slug, changeset) do
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query = from t in Tag,
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where: t.slug == ^slug
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case Repo.one(query) do
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nil -> slug
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_story ->
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slug
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|> increment_slug
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|> build_unique_slug(changeset)
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end
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end
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defp increment_slug(slug) do
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case List.pop_at(String.split(slug, "-"), -1) do
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{nil, _} ->
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slug
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{suffix, slug_parts} ->
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case Integer.parse(suffix) do
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{id, _} -> Enum.join(slug_parts, "-") <> "-" <> Integer.to_string(id + 1)
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:error -> slug <> "-1"
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end
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end
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end
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end
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defmodule Eventos.Events.Tag do
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use Ecto.Schema
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import Ecto.Changeset
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alias Eventos.Events.Tag
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alias Eventos.Events.Tag.TitleSlug
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schema "tags" do
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field :title, :string
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field :slug, TitleSlug.Type
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timestamps()
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end
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@doc false
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def changeset(%Tag{} = tag, attrs) do
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tag
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|> cast(attrs, [:title])
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|> validate_required([:title])
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|> TitleSlug.maybe_generate_slug()
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|> TitleSlug.unique_constraint()
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end
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end |