Ecto.DevLogger

An alternative logger for Ecto queries.

It inlines bindings into the query, so it is easy to copy-paste logged SQL and run it in any IDE for debugging without manual transformation of common elixir terms to string representation (binary UUID, DateTime, Decimal, json, etc). Also, it highlights db time to make slow queries noticeable. Source table and inlined bindings are highlighted as well.

Format queries

It is possible to format queries using a :before_inline_callback option. Here is an example of setup using pgFormatter as an external utility:

defmodule MyApp.Application do
  def start(_type, _args) do
    Ecto.DevLogger.install(MyApp.Repo, before_inline_callback: &__MODULE__.format_sql_query/1)
  end

  def format_sql_query(query) do
    case System.shell("echo $SQL_QUERY | pg_format -", env: [{"SQL_QUERY", query}], stderr_to_stdout: true) do
      {formatted_query, 0} -> String.trim_trailing(formatted_query)
      _ -> query
    end
  end
end