PhoenixSwagger.Schema.unique_items

You're seeing just the function unique_items, go back to PhoenixSwagger.Schema module for more information.

unique_items(model, unique?)

Boolean that when true, requires each item of an array schema to be unique.

iex> alias PhoenixSwagger.Schema
...> %Schema{type: :array}
...> |> Schema.unique_items(true)
%PhoenixSwagger.Schema{type: :array, uniqueItems: true}