Default value for {:array, :map} in migrations

[zipme]

I am using `embeds_many` and the documentation says that "It is recommended to declare your embeds_many/3 field with type {:array, :map} and default value of [] at the database level."

So I try to do something like `add :items, {:array, :map}, default: []` in my migration.

However, when I run `mix ecto.migrate` I got the following error:

```

** (FunctionClauseError) no function clause matching in Ecto.Adapters.Postgres.Connection.default_expr/1

    (ecto) lib/ecto/adapters/postgres/connection.ex:597: Ecto.Adapters.Postgres.Connection.default_expr([])

    (ecto) lib/ecto/adapters/postgres/connection.ex:587: Ecto.Adapters.Postgres.Connection.column_options/1

    (ecto) lib/ecto/adapters/postgres/connection.ex:563: Ecto.Adapters.Postgres.Connection.column_change/1

    (elixir) lib/enum.ex:1008: anonymous fn/4 in Enum.map_join/3

    (elixir) lib/enum.ex:1261: Enum."-reduce/3-lists^foldl/2-0-"/3

    (elixir) lib/enum.ex:1007: Enum.map_join/3

    (ecto) lib/ecto/adapters/postgres/connection.ex:503: Ecto.Adapters.Postgres.Connection.execute_ddl/1

    (ecto) lib/ecto/adapters/postgres.ex:55: Ecto.Adapters.Postgres.execute_ddl/3

```

Any idea how I can specify the default as empty array for `{:array, :map}`? Do I need to use `fragment/1` for this? If so what should be the expression?

Thanks in advance.

[zipme]

Seems `add :items, {:array, :map}, default: fragment("ARRAY[]::jsonb[]")` works

在 2015年8月14日星期五 UTC+8下午3:18:06，zipme写道：

[José Valim]

In master you will be able to do "default: []".

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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