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第一:我找到了这个topic,但它不起作用。Elixir Ecto插入空的belongs_to
我有两个型号
Council(1)<->(n)Department
之间的关系,我想插入理事会未经关系到一个部门。
我有了这个外生模式:
schema "councils" do
field :name, :string
field :description, :string
belongs_to :department, Db2.Department
many_to_many :students, Db2.Student, join_through: Db2.StudentCouncil
many_to_many :periods, Db2.Period, join_through: Db2.StudentCouncil
timestamps()
end
这个SQL模式:
CREATE TABLE public.councils
(
id integer NOT NULL DEFAULT nextval('councils_id_seq'::regclass),
name character varying(255),
description character varying(255),
department_id integer,
inserted_at timestamp without time zone NOT NULL,
updated_at timestamp without time zone NOT NULL,
CONSTRAINT councils_pkey PRIMARY KEY (id),
CONSTRAINT councils_department_id_fkey FOREIGN KEY (department_id)
REFERENCES public.departments (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
文档说cast/4
已被弃用,但凤凰在自身变更与cast/3
& validate_required/3
。我只加了department
让我有以下变更:
def changeset(struct, params \\ %{}) do
struct
|> cast(params, [:name, :description, :department_id])
|> validate_required([:name])
|> unique_constraint(:name)
|> assoc_constraint(:department)
end
对于使用默认phoenix.html表单元素的形式我'。 当我提交表单凤说以下内容:
[debug] QUERY OK db=1.2ms queue=0.1ms
SELECT u0."id", u0."uid", u0."is_admin", u0."is_staff", u0."password_hash", u0."inserted_at", u0."updated_at" FROM "users" AS u0 WHERE (u0."id" = $1) [1]
[debug] Processing by Db2.CouncilController.create/2
Parameters: %{"_csrf_token" => "KwpdFCZ/bFN9fwkcXSAYLhRCIzgOAAAAXeoEa4+d1MoT7SvzZpgOdg==", "_utf8" => "✓", "council" => %{"department_id" => "", "description" => "", "name" => "test2"}}
Pipelines: [:browser]
[debug] QUERY OK db=1.2ms queue=0.1ms
#Ecto.Changeset<action: :insert, changes: %{description: "", name: "test2"},
errors: [department_id: {"is invalid", [type: :id]}], data: #Db2.Council<>,
valid?: false>
wo?t?谢谢。奇迹般有效 :) –