[英]Why is phoenix_ecto failing to compile on the :model in the changeset?
[英]Trouble with Phoenix / Ecto Changeset
我在Ecto Changeset上度过了一段糟糕的时光。 我正在尝试简单地创建一个带有“空”变更集的新表单。 命中控制器,并调用Session.changeset(%Session{})
行。 然后,它命中Site.Session.changeset
。 在那里, cast
调用失败并显示以下错误。 下面是完整的堆栈跟踪。 Elixir 1.4,雨伞应用。
控制器:
defmodule Site.SessionController do
use Site.Web, :controller
alias Site.Session
def login_form(conn, _params) do
changeset = Session.changeset(%Session{})
conn |> render "login_form.html", changeset: changeset
end
end
模块:
defmodule Site.Session do
import Ecto.Changeset
defstruct [:email, :password]
@required_fields ~w(email password)
@optional_fields ~w()
@doc """
Builds a changeset based on the `struct` and `params`.
"""
def changeset(struct, params \\ %{}) do
struct
|> cast(params, @required_fields ++ @optional_fields)
end
end
错误:
function Site.Session.__changeset__/0 is undefined or private. Did you mean one of:
* changeset/1
* changeset/2
堆栈跟踪:
Request: GET /login
** (exit) an exception was raised:
** (UndefinedFunctionError) function Site.Session.__changeset__/0 is undefined or private. Did you mean one of:
* changeset/1
* changeset/2
(site) Site.Session.__changeset__()
(ecto) lib/ecto/changeset.ex:422: Ecto.Changeset.do_cast/4
(site) web/controllers/session_controller.ex:9: Site.SessionController.login_form/2
(site) web/controllers/session_controller.ex:3: Site.SessionController.action/2
(site) web/controllers/session_controller.ex:3: Site.SessionController.phoenix_controller_pipeline/2
(site) lib/site/endpoint.ex:1: Site.Endpoint.instrument/4
(site) lib/phoenix/router.ex:261: Site.Router.dispatch/2
(site) web/router.ex:1: Site.Router.do_call/2
(site) lib/site/endpoint.ex:1: Site.Endpoint.phoenix_pipeline/1
(site) lib/plug/debugger.ex:123: Site.Endpoint."call (overridable 3)"/2
(site) lib/site/endpoint.ex:1: Site.Endpoint.call/2
(plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
(cowboy)
上面Dogdog的评论是正确的。 我错过了架构。 我当时以为它不会持久化,并且模块中有一个defstruct
,但是可惜:孩子们,别忘了这个架构。
defmodule Site.Session do
use Ecto.Schema
import Ecto.Changeset
@required_fields ~w(email password)
@optional_fields ~w()
schema "sessions" do
field :email, :string
field :password, :string
end
@doc """
Builds a changeset based on the `struct` and `params`.
"""
def changeset(struct, params \\ %{}) do
struct
|> cast(params, @required_fields ++ @optional_fields)
end
end
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.