[英]Using Ecto in Elixir, this can't evaluate the unique contrant for an existing index
我有一個現有的數據庫,並且該表中有一個唯一索引
ALTER TABLE ONLY users ADD CONSTRAINT unique_document_id UNIQUE (document_id);
我在Ecto中沒有任何遷移,我想使用變更集插入新記錄。 這是來自模型的代碼和要插入的代碼
defmodule User do
use Ecto.Schema
schema "users" do
field :name
field :email
field :document_id
end
def signup(name, id_number, email) do
changeset = User.changeset(%User{}, %{name: name,
email: email,
document_id: id_number})
if changeset.valid? do
IO.inspect "the chagenset is valid"
user = case Repo.insert(changeset) do
{:ok, model} -> {:ok, model }
{:error, changeset} -> {:error, changeset.errors}
end
end
def changeset(driver, params \\ :empty) do
driver
|> cast(params, [:document_id, :email, :name])
|> validate_required([:document_id, :email, :name])
|> unique_constraint(:document_id)
|> unique_constraint(:email)
end
end
end
但是,當我嘗試插入重復的用戶時,出現此錯誤和changeset.valid嗎? 是真的
11:04:17.896 [error] #PID<0.434.0> running App terminated
Server: localhost:4000 (http)
Request: POST /api/signup
** (exit) an exception was raised:
** (Ecto.ConstraintError) constraint error when attempting to insert struct:
* unique: unique_document_id
If you would like to convert this constraint into an error, please
call unique_constraint/3 in your changeset and define the proper
constraint name. The changeset defined the following constraints:
* unique: users_document_id_index
(ecto) lib/ecto/repo/schema.ex:493: anonymous fn/4 in Ecto.Repo.Schema.constraints_to_errors/3
(elixir) lib/enum.ex:1229: Enum."-map/2-lists^map/1-0-"/2
(ecto) lib/ecto/repo/schema.ex:479: Ecto.Repo.Schema.constraints_to_errors/3
(ecto) lib/ecto/repo/schema.ex:213: anonymous fn/13 in Ecto.Repo.Schema.do_insert/4
(ecto) lib/ecto/repo/schema.ex:684: anonymous fn/3 in Ecto.Repo.Schema.wrap_in_transaction/6
(ecto) lib/ecto/adapters/sql.ex:620: anonymous fn/3 in Ecto.Adapters.SQL.do_transaction/3
(db_connection) lib/db_connection.ex:1275: DBConnection.transaction_run/4
(db_connection) lib/db_connection.ex:1199: DBConnection.run_begin/3
您需要在對unique_constraint
的調用中指定約束名稱,因為它不是默認的Ecto約定(如錯誤消息users_document_id_index
,它是users_document_id_index
):
|> unique_constraint(:document_id, name: :unique_document_id)
如果電子郵件也有唯一的約束名稱,而不是users_name_index
,則也需要對unique_constraint(:name)
進行相同的unique_constraint(:name)
。
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