相关疑难解决方法(0)

我尝试执行以下迁移:

defmodule Shopper.Repo.Migrations.MakeNameUniqueShopper do
  use Ecto.Migration

  def change do
    create unique_index :shoppers, [:name]
  end
end

也试过create unique_index :shoppers, [:name], name: :name_unique,create unique_index :shoppers, [:name], name: "name_unique"和create index(:shoppers, [:name], unique: true)

但他们失败了类似的错误:

[info]  == Running Shopper.Repo.Migrations.MakeNameUniqueShopper.change/0 forward

[info]  create index shoppers_name_index
** (Mariaex.Error) (1071): Specified key was too long; max key length is 767 bytes
    (ecto) lib/ecto/adapters/sql.ex:172: Ecto.Adapters.SQL.query!/5
    (elixir) lib/enum.ex:1261: Enum."-reduce/3-lists^foldl/2-0-"/3
...
...

任何帮助将非常感谢,以帮助我解决错误.

注意:我正在使用ecto 1.02

以下是第一次创建的迁移 mix phoenix.gen.model

defmodule Shopper.Repo.Migrations.CreateV1.Shopper do
  use Ecto.Migration

  def …