# `Hakushi.Graph.Type`
[🔗](https://github.com/hattoriai/hakushi/blob/v0.1.0/lib/hakushi/graph/type.ex#L2)

An Ecto type for a whole canvas in one column: a `:map` (`jsonb` on
PostgreSQL, JSON text on SQLite and MySQL).

    schema "diagrams" do
      field :graph, Hakushi.Graph.Type, default: Hakushi.Graph.new()
    end

    # the migration
    add :graph, :map, null: false, default: %{}

The column holds `Hakushi.Graph.dump/1`'s maps, so the `data` of the
nodes and edges must be JSON-able, and comes back with string keys.
A canvas whose nodes are rows of their own (the tables of a schema, the
steps of a workflow) keeps them in its own tables instead, and makes
its graph of them.

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*Consult [api-reference.md](api-reference.md) for complete listing*