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user_handler.ex
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user_handler.ex
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defmodule PlugApp.UserHandler do
alias OpenApiSpex.Operation
alias PlugApp.{Accounts, Accounts.User}
alias PlugApp.Schemas
import OpenApiSpex.Operation, only: [parameter: 5, request_body: 4, response: 3]
defmodule Index do
use Plug.Builder
plug OpenApiSpex.Plug.Cast, operation_id: "UserHandler.Index"
plug OpenApiSpex.Plug.Validate
plug :index
def open_api_operation(_) do
%Operation{
tags: ["users"],
summary: "List users",
description: "List all useres",
operationId: "UserHandler.Index",
responses: %{
200 => response("User List Response", "application/json", Schemas.UsersResponse)
}
}
end
def index(conn, _opts) do
users = Accounts.list_users()
conn
|> Plug.Conn.put_resp_header("Content-Type", "application/json")
|> Plug.Conn.send_resp(200, render(users))
end
def render(users) do
%{
data: Enum.map(users, &Map.take(&1, [:id, :name, :email]))
}
|> Jason.encode!(pretty: true)
end
end
defmodule Show do
use Plug.Builder
plug OpenApiSpex.Plug.Cast, operation_id: "UserHandler.Show"
plug OpenApiSpex.Plug.Validate
plug :load
plug :show
def open_api_operation(_) do
%Operation{
tags: ["users"],
summary: "Show user",
description: "Show a user by ID",
operationId: "UserHandler.Show",
parameters: [
parameter(:id, :path, :integer, "User ID", example: 123, minimum: 1)
],
responses: %{
200 => response("User", "application/json", Schemas.UserResponse)
}
}
end
def load(conn = %Plug.Conn{params: %{id: id}}, _opts) do
case Accounts.get_user!(id) do
nil ->
conn
|> put_resp_content_type("application/json")
|> send_resp(404, ~s({"error": "User not found"}))
|> halt()
user -> assign(conn, :user, user)
end
end
def show(conn = %Plug.Conn{assigns: %{user: user}}, _opts) do
conn
|> put_resp_header("Content-Type", "application/json")
|> send_resp(200, render(user))
end
def render(user) do
%{
data: Map.take(user, [:id, :name, :email])
}
|> Jason.encode!(pretty: true)
end
end
defmodule Create do
use Plug.Builder
plug OpenApiSpex.Plug.Cast, operation_id: "UserHandler.Create"
plug OpenApiSpex.Plug.Validate
plug :create
def open_api_operation(_) do
%Operation{
tags: ["users"],
summary: "Create user",
description: "Create a user",
operationId: "UserHandler.Create",
requestBody: request_body("The user attributes", "application/json", Schemas.UserRequest, required: true),
responses: %{
201 => response("User", "application/json", Schemas.UserResponse)
}
}
end
def create(conn = %Plug.Conn{body_params: %Schemas.UserRequest{user: user_params}}, _opts) do
with {:ok, %User{} = user} <- Accounts.create_user(user_params) do
conn
|> put_resp_content_type("application/json")
|> send_resp(201, Show.render(user))
end
end
end
end

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