postgresql 如何使用 Postgres 使用 Ecto 存储数组
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How to store array with Ecto using Postgres
提问by Josh Petitt
I would like to store an array of floating point values with Ecto using Postgres. I'm using Ecto with the Phoenix Framework and Elixir.
我想使用 Postgres 使用 Ecto 存储浮点值数组。我正在使用带有 Phoenix 框架和 Elixir 的 Ecto。
How would I define my model and migration for this?
我将如何为此定义我的模型和迁移?
I haven't tried much, except searching the web, which didn't find anything useful :-(
我没有尝试太多,除了搜索网络,没有找到任何有用的东西:-(
I did try defining a model with a schema like this:
我确实尝试使用这样的模式定义模型:
schema "my_model" do
field :my_array, :array
timestamps
end
which gave an error "invalid or unknown type :array for field :my_array"
这给出了错误“无效或未知类型:字段的数组:my_array”
回答by Josh Petitt
I found the answer in the list of primitive types for Ecto.Schema here:
我在 Ecto.Schema 的原始类型列表中找到了答案:
The answer is to define the type like this:
答案是这样定义类型:
schema "my_model" do
field :my_array, {:array, :float}
timestamps
end
回答by Bartek Skwira
As Josh wrote use the array type from Ecto.Schema
正如 Josh 所写,使用Ecto.Schema 中的数组类型
In the model:
在模型中:
schema "my_model" do
field :my_array, {:array, inner_type}
end
@neildaemond Migration:
@neildaemond 迁移:
alter table(:my_models) do
add :my_array, {:array, inner_type}
end
Replace inner_type
with one of the valid types, such as :string
.
替换inner_type
为有效类型之一,例如:string
.
You can also do the same thing with a map
type:
你也可以用一个map
类型做同样的事情:
schema "my_model" do
field :my_map, {:map, inner_type}
end