EctoAutoslugField

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ecto_autoslug_field is a reusable Ecto library which can automatically create slugs from other fields.

This librabry internaly uses slugger as a default slug-engine.

Installation

def deps do
  # installation via hex:
  [{:ecto_autoslug_field, "~> 0.1"}]

  # if you want to use github:
  # [{:ecto_autoslug_field, github: "sobolevn/ecto_autoslug_field"}]
end

Examples

The simplest example:

defmodule NameSlug do
  use EctoAutoslugField.Slug, from: :name, to: :slug
end

defmodule User do
  use Ecto.Schema
  import Ecto.Changeset

  schema "users" do
    field :name, :string
    field :slug, NameSlug.Type
  end

  @required_fields ~w(name)
  @optional_fields ~w(slug)

  def changeset(model, params \\ :empty) do
    model
    |> cast(params, @required_fields, @optional_fields)
    |> NameSlug.maybe_generate_slug
    |> NameSlug.unique_constraint
  end
end

More complex example:

defmodule ComplexSlug do
  use EctoAutoslugField.Slug, to: :slug

  def get_sourses(changeset, _opts) do
    # This function is used to get sources to build slug from:
    base_fields = [:title]

    if get_change(changeset, :breaking, false) do
      base_fields ++ ["breaking"]
    else
      base_fields
    end
  end

  def build_slug(sources) do
    # Custom slug building rule:
    sources
    |> Enum.join("-")
    |> Slugger.slugify_downcase
    |> String.replace("-", "+")
  end
end

defmodule Article do
  use Ecto.Schema
  import Ecto.Changeset

  schema "articles" do
    field :title, :string
    field :breaking, :boolean
    field :slug, ComplexSlug.Type
  end

  @required_fields ~w(title breaking)
  @optional_fields ~w(slug)

  def changeset(model, params \\ :empty) do
    model
    |> cast(params, @required_fields, @optional_fields)
    |> ComplexSlug.maybe_generate_slug
    |> ComplexSlug.unique_constraint
  end
end

Changelog

See CHANGELOG.md.

License

MIT. Please see LICENSE.md for licensing details.