Elixir EXTO中“多对多”关联的外键名

这里有一个问题要问很多人。我得到的错误是

INSERT INTO "qbinders" ("title","typecode","inserted_at","updated_at","id") VALUES ($1,$2,$3,$4,$5) ["Math", "Jim1000", {{2017, 4, 1}, {15, 4, 47, 827009}}, {{2017, 4, 1}, {15, 4, 47, 843348}}, <<68, 1
49, 156, 219, 153, 214, 65, 63, 179, 141, 252, 147, 221, 247, 41, 143>>]
[debug] QUERY OK db=0.9ms
commit []
** (Postgrex.Error) ERROR 42703 (undefined_column): column q2.qbinders_id does not exist

在postgres中，联接表如下所示

CREATE TABLE qbook2qbinder
(
  qbook_id uuid,
  qbinder_id uuid,
  qbook_order integer,
  inserted_at timestamp without time zone NOT NULL,
  updated_at timestamp without time zone NOT NULL,
  CONSTRAINT qbook2qbinder_qbinder_id_fkey FOREIGN KEY (qbinder_id)
      REFERENCES qbinders (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION,
  CONSTRAINT qbook2qbinder_qbook_id_fkey FOREIGN KEY (qbook_id)
      REFERENCES qbooks (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
)

模型是

defmodule Project.Qbinders do
  use Project.Web, :model

  @primary_key {:id, :binary_id, autogenerate: true}

  schema "qbinders" do

        field :title, :string
        field :reward, :string

        many_to_many :qbooks, Project.Qbooks, join_through: "qbook2qbinder"
    timestamps
  end

---

为什么Ecto寻找qbinder_id而不是qbinder_id？如何将其设置为qbinder_id？

这很容易通过的参数进行自定义

可以使用选项join_键配置列名，使用方式如下：

many_to_many :qbooks, Project.Qbooks, join_through: "qbook2qbinder",
                                      join_keys: [{qbook_id: :id, qbinder_id: :id}]

---

我怀疑这是因为您的模型名是Qbinders，因此，列名是从该名称派生的。您应该能够配置自己与join_keys关键字参数的关联-请检查此点。谢谢如果你加上答案，我会接受的。很乐意帮忙！干杯

many_to_many :qbooks, Project.Qbooks, join_through: "qbook2qbinder",
                                      join_keys: [{qbook_id: :id, qbinder_id: :id}]