blockscout/lib/explorer/schemas/block.ex

defmodule Explorer.Block do
  @moduledoc """
    Stores a web3 block.
  """

  use Explorer.Schema

  alias Explorer.Block
  alias Explorer.BlockTransaction
  alias Explorer.Transaction

  schema "blocks" do
    has_many(:block_transactions, BlockTransaction)
    many_to_many(:transactions, Transaction, join_through: "block_transactions")

    field(:number, :integer)
    field(:hash, :string)
    field(:parent_hash, :string)
    field(:nonce, :string)
    field(:miner, :string)
    field(:difficulty, :decimal)
    field(:total_difficulty, :decimal)
    field(:size, :integer)
    field(:gas_limit, :integer)
    field(:gas_used, :integer)
    field(:timestamp, Timex.Ecto.DateTime)
    timestamps()
  end

  @required_attrs ~w(number hash parent_hash nonce miner difficulty
                     total_difficulty size gas_limit gas_used timestamp)a

  @doc false
  def changeset(%Block{} = block, attrs) do
    block
    |> cast(attrs, @required_attrs)
    |> validate_required(@required_attrs)
    |> update_change(:hash, &String.downcase/1)
    |> unique_constraint(:hash)
    |> cast_assoc(:transactions)
  end

  def null, do: %Block{number: -1, timestamp: :calendar.universal_time()}

  def latest(query) do
    query |> order_by(desc: :number)
  end
end