Ventsislav Nikolov ventsislaf

Note: Don't do this on a production evniroment!

Get the heroku database name:

heroku pg:info

Name can be found in the reponse from the command above. For example: Add-on: soaring-newly-1337.

Example code:

def changeset(model, params \\ :empty) do
  model
  |> cast(params, @required_fieds, @optional_fields)
  |> validate_length(:code, is: 2)
  |> normalize_code
end

from(u in User, select: count(u.id)) |> Repo.one!

Execute this in the Rails console and then all SQL queries from ActiveRecord will be shown:

ActiveRecord::Base.logger = Logger.new(STDOUT)

After updating postgres brew formula or OS X, afterwards there could be an error similar to:

psql: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

One possible fix is:

Initialize your git repository git init. This would save you later a step to add heroku as remote.

Move configuration from config/prod.secret.exs to config/prod.exs and replace the following parts:

config :app_name, AppName.Endpoint,
  secret_key_base: System.get_env("SECRET_KEY_BASE")

# Configure your database
config :app_name, AppName.Repo,

	list = Enum.to_list(1..100_000)

	Benchee.init(%{time: 3})
	\|> Benchee.benchmark("Enum.at", fn -> Enum.at(list, length(list) - 2) end)
	\|> Benchee.benchmark(
	"revers + pattern matching",
	fn ->
	[_, next_to_last \| _] = Enum.reverse(list)
	next_to_last
	end