How to store array with Ecto using Postgres
PostgresqlPhoenix FrameworkEctoPostgresql Problem Overview
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.
How would I define my model and migration for this?
I haven't tried much, except searching the web, which didn't find anything useful :-(
I did try defining a model with a schema like this:
schema "my_model" do
field :my_array, :array
timestamps
end
which gave an error "invalid or unknown type :array for field :my_array"
Postgresql Solutions
Solution 1 - Postgresql
I found the answer in the list of primitive types for Ecto.Schema here:
The answer is to define the type like this:
schema "my_model" do
field :my_array, {:array, :float}
timestamps
end
Solution 2 - Postgresql
As Josh wrote use the array type from Ecto.Schema
In the model:
schema "my_model" do
field :my_array, {:array, inner_type}
end
@neildaemond Migration:
alter table(:my_models) do
add :my_array, {:array, inner_type}
end
Replace inner_type
with one of the valid types, such as :string
.
You can also do the same thing with a map
type:
schema "my_model" do
field :my_map, {:map, inner_type}
end