我的用户模型的<svg version="1.1" id="graph" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
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字段属于matches类型。我正在尝试在控制台中更新它，但它无法正常工作：
:map这是我的用户模型：
iex(16)> changeset = User.changeset(u, %{ matches: %{ "123": true } })
#Ecto.Changeset<action: nil, changes: %{}, errors: [], data: #VideoChat.User<>,
valid?: true>
iex(18)> VideoChat.Repo.update(changeset)
{:ok,
%VideoChat.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">,
device_identifier: "123", id: 1,
inserted_at: #Ecto.DateTime<2016-12-06 23:02:56>, matches: %{},
updated_at: #Ecto.DateTime<2016-12-06 23:02:56>}}
iex(19)> u = User |> VideoChat.Repo.one
[debug] QUERY OK source="users" db=1.2ms
SELECT u0."id", u0."device_identifier", u0."matches", u0."inserted_at", u0."updated_at" FROM "users" AS u0 []
%VideoChat.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">,
device_identifier: "123", id: 1,
inserted_at: #Ecto.DateTime<2016-12-06 23:02:56>, matches: %{},
updated_at: #Ecto.DateTime<2016-12-06 23:02:56>}
如何更新：地图字段？