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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
lib/phoenix_kit/users/role_assignment.ex
defmodule PhoenixKit.Users.RoleAssignment do
@moduledoc """
Role assignment schema for PhoenixKit authorization system.
This schema represents the many-to-many relationship between users and roles,
with additional metadata about when and by whom the role was assigned.
## Fields
- `user_id`: Reference to the user who has the role
- `role_id`: Reference to the role being assigned
- `assigned_by`: Reference to the user who assigned this role (can be nil for system assignments)
- `assigned_at`: Timestamp when the role was assigned
## Features
- Tracks role assignment history
- Supports bulk role management
- Audit trail for security purposes
- Direct deletion for role removal
"""
use Ecto.Schema
import Ecto.Changeset
@type t :: %__MODULE__{
id: integer() | nil,
user_id: integer(),
role_id: integer(),
assigned_by: integer() | nil,
assigned_at: NaiveDateTime.t(),
inserted_at: NaiveDateTime.t()
}
schema "phoenix_kit_user_role_assignments" do
belongs_to :user, PhoenixKit.Users.Auth.User
belongs_to :role, PhoenixKit.Users.Role
belongs_to :assigned_by_user, PhoenixKit.Users.Auth.User, foreign_key: :assigned_by
field :assigned_at, :naive_datetime
timestamps(updated_at: false)
end
@doc """
A role assignment changeset for creating role assignments.
## Parameters
- `role_assignment`: The role assignment struct to modify
- `attrs`: Attributes to update
## Examples
iex> changeset(%RoleAssignment{}, %{user_id: 1, role_id: 2})
%Ecto.Changeset{valid?: true}
iex> changeset(%RoleAssignment{}, %{})
%Ecto.Changeset{valid?: false}
"""
def changeset(role_assignment, attrs) do
role_assignment
|> cast(attrs, [:user_id, :role_id, :assigned_by, :assigned_at])
|> validate_required([:user_id, :role_id])
|> put_assigned_at()
|> unique_constraint([:user_id, :role_id],
name: :phoenix_kit_user_role_assignments_user_id_role_id_index,
message: "user already has this role"
)
|> foreign_key_constraint(:user_id)
|> foreign_key_constraint(:role_id)
|> foreign_key_constraint(:assigned_by)
end
# Set assigned_at to current time if not provided
defp put_assigned_at(changeset) do
case get_field(changeset, :assigned_at) do
nil ->
put_change(
changeset,
:assigned_at,
NaiveDateTime.utc_now() |> NaiveDateTime.truncate(:second)
)
_ ->
changeset
end
end
end