如何在Ecto中更改字段类型? [英] How to change field type in Ecto?

问题描述

我有一个模式:

schema "editables" do
    field :title, :string
    field :content, :string

    timestamps
  end

现在，我想将一个字段的类型从:integer更改为:binary. 编写迁移的正确方法是什么，因为使用add不起作用...?

Now I want to change the type of one field form :integer to :binary. What's the correct way of writing the migration because using add is not working...?

def change do
    alter table(:editables) do
      add :title, :binary
      add :content, :binary

      timestamps
    end
  end

推荐答案

您必须使用

You have to use modify/3 to change the type. add/3 is only for adding new columns.

alter table(:editables) do
  modify :content, :binary
end

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