Option to make any generated data unique

[chvanikoff]

From project to project, I keep bringing my tiny function of making generated data unique:

def make_unique(string) do
  "#{string}#{System.unique_integer([:positive, :monotonic])}"
end

make_unique(Faker.Pokemon.name())

While it's really tiny, I thought what if we had an option to pass extra opts, like unique: true, to any of the Faker modules functions? i.e., Faker.For example, Pokemon.name(unique: true) would generate Pikachu42.

[adonig]

When you use Faker with ExMachina you can use sequence/1 and sequence/2 to make something unique:

defmodule MyApp.Factory do
  use ExMachina
 
  def github_repo_factory do
    repo_name = sequence(:github_repo_name, &"repo-#{&1}")
 
    %GitHub.Repo{
      id: 1296269,
      name: repo_name,
      full_name: "octocat/#{repo_name}",
      description: "This your first repo!",
      owner_id: 1,
      owner_url: "https://api.github.com/users/octocat",
      private: false,
      html_url: "https://github.com/octocat/#{repo_name}",
      url: "https://api.github.com/repos/octocat/#{repo_name}"
    }
  end
end

You can then build multiple repos at once:

MyApp.Factory.build_list(3, :github_repo)
[
  %GitHub.Repo{
    name: "octocat/repo-1"
    # ...
  },
  %GitHub.Repo{
    name: "octocat/repo-2"
    # ...
  }
    %GitHub.Repo{
    name: "octocat/repo-3"
    # ...
  }
]