Validation 外部模型参数未验证?
可能是我遗漏了什么,但它觉得这应该是一个无效的记录:Validation 外部模型参数未验证?,validation,elixir,ecto,Validation,Elixir,Ecto,可能是我遗漏了什么,但它觉得这应该是一个无效的记录: pry(1)> project_params %{"name" => ""} pry(2)> changeset %Ecto.Changeset{action: nil, changes: %{name: ""}, constraints: [], errors: [], filters: %{}, model: %Elix.Project{__meta__: #Ecto.Schema.Metadata<:buil
pry(1)> project_params
%{"name" => ""}
pry(2)> changeset
%Ecto.Changeset{action: nil, changes: %{name: ""}, constraints: [], errors: [],
filters: %{},
model: %Elix.Project{__meta__: #Ecto.Schema.Metadata<:built>, id: nil,
inserted_at: nil, name: nil, updated_at: nil,
user: #Ecto.Association.NotLoaded<association :user is not loaded>,
user_id: 2}, optional: [], opts: [], params: %{"name" => ""}, prepare: [],
repo: nil, required: [:name, :user_id],
types: %{id: :id, inserted_at: Ecto.DateTime, name: :string,
updated_at: Ecto.DateTime, user_id: :id}, valid?: true, validations: []}
pry(3)> changeset.valid?
true
用户
defmodule Elix.User do
use Elix.Web, :model
schema "users" do
field :email, :string
field :password, :string, virtual: true
field :crypted_password, :string
has_many :projects, Elix.Project
timestamps
end
@required_fields ~w(email password)
@optional_fields ~w()
@doc """
Creates a changeset based on the `model` and `params`.
If no params are provided, an invalid changeset is returned
with no validation performed.
"""
def changeset(model, params \\ :empty) do
model
|> cast(params, @required_fields, @optional_fields)
|> unique_constraint(:email)
|> validate_format(:email, ~r/@/)
|> validate_length(:password, min: 5)
end
end
这是控制器创建操作的代码:
def create(conn, %{"project" => project_params}) do
changeset =
Ecto.build_assoc(conn.assigns.current_user, :projects) |>
Project.changeset(project_params)
IEx.pry
case Repo.insert(changeset) do
{:ok, project} ->
conn
|> put_flash(:info, "Project #{project.name} created succesfully")
|> redirect(to: project_path(conn, :index))
{:error, changeset} ->
render(conn, "new.html", project: changeset)
end
end
我提交表单时没有故意输入任何内容,以便测试表单显示错误。这里我缺少了什么?如果
name
的值为nil
,则变更集有效?
将仅为false
。由于案例中name
的值为空字符串,因此变更集将有效
处理将空字符串作为值传递的表单的最佳位置是在控制器中添加scrub_params
插件,如下所示:
plug:scrub_参数,在[:create,:update]中执行操作时“项目”
查看查看更多有关
scrub_params
的信息,在控制器中[:create,:update]中执行操作时是否有插件:scrub_params,“project”?我没有。所以一个空字符串被认为是有效的?是的,一个空字符串是有效的。这就是“擦洗”参数的目的。它会将空字符串变为nil
您能添加一个答案吗?我会标记它吗?如果名称不为空是您业务逻辑的一部分,我肯定会添加一个验证程序来验证它的长度,就像您对密码所做的那样scrub_params
很好,但很容易在将来的某个控制器中意外忘记执行此操作。插入长度验证器更安全,您仍然可以插入scrub_参数。您是对的。我当时的印象是,默认情况下,埃克托会处理它:)
def create(conn, %{"project" => project_params}) do
changeset =
Ecto.build_assoc(conn.assigns.current_user, :projects) |>
Project.changeset(project_params)
IEx.pry
case Repo.insert(changeset) do
{:ok, project} ->
conn
|> put_flash(:info, "Project #{project.name} created succesfully")
|> redirect(to: project_path(conn, :index))
{:error, changeset} ->
render(conn, "new.html", project: changeset)
end
end