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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
Current section
Files
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Files
lib/modules/comments/schemas/comment.ex
defmodule PhoenixKit.Modules.Comments.Comment do
@moduledoc """
Schema for polymorphic comments with unlimited threading depth.
Supports nested comment threads (Reddit-style) with self-referencing parent/child
relationships. Can be attached to any resource type via `resource_type` + `resource_uuid`.
## Comment Status
- `published` - Comment is visible
- `hidden` - Comment is hidden by moderator
- `deleted` - Comment deleted (soft delete)
- `pending` - Awaiting moderation approval
## Fields
- `resource_type` - Type of resource (e.g., "post", "entity", "ticket")
- `resource_uuid` - UUID of the resource
- `user_uuid` - Reference to the commenter
- `parent_uuid` - Reference to parent comment (nil for top-level)
- `content` - Comment text
- `status` - published/hidden/deleted/pending
- `depth` - Nesting level (0=top, 1=reply, 2=reply-to-reply, etc.)
- `like_count` - Denormalized like counter
- `dislike_count` - Denormalized dislike counter
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key {:uuid, UUIDv7, autogenerate: true, source: :id}
@type t :: %__MODULE__{
uuid: UUIDv7.t() | nil,
resource_type: String.t(),
resource_uuid: Ecto.UUID.t(),
user_uuid: UUIDv7.t() | nil,
parent_uuid: UUIDv7.t() | nil,
content: String.t(),
status: String.t(),
depth: integer(),
like_count: integer(),
dislike_count: integer(),
user: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t() | nil,
parent: t() | Ecto.Association.NotLoaded.t() | nil,
children: [t()] | Ecto.Association.NotLoaded.t(),
inserted_at: DateTime.t() | nil,
updated_at: DateTime.t() | nil
}
schema "phoenix_kit_comments" do
field :resource_type, :string
field :resource_uuid, Ecto.UUID
field :content, :string
field :status, :string, default: "published"
field :depth, :integer, default: 0
field :like_count, :integer, default: 0
field :dislike_count, :integer, default: 0
belongs_to :user, PhoenixKit.Users.Auth.User,
foreign_key: :user_uuid,
references: :uuid,
type: UUIDv7
belongs_to :parent, __MODULE__,
foreign_key: :parent_uuid,
references: :uuid,
type: UUIDv7
has_many :children, __MODULE__, foreign_key: :parent_uuid
timestamps(type: :utc_datetime)
end
@doc """
Changeset for creating or updating a comment.
## Required Fields
- `resource_type` - Type of resource being commented on
- `resource_uuid` - UUID of the resource
- `user_uuid` - Reference to commenter
- `content` - Comment text
"""
def changeset(comment, attrs) do
comment
|> cast(attrs, [
:resource_type,
:resource_uuid,
:user_uuid,
:parent_uuid,
:content,
:status,
:depth
])
|> validate_required([:resource_type, :resource_uuid, :user_uuid, :content])
|> validate_inclusion(:status, ["published", "hidden", "deleted", "pending"])
|> validate_length(:content, min: 1, max: 10_000)
|> validate_length(:resource_type, max: 50)
|> foreign_key_constraint(:user_uuid)
|> foreign_key_constraint(:parent_uuid)
end
@doc "Check if comment is a reply (has parent)."
def reply?(%__MODULE__{parent_uuid: nil}), do: false
def reply?(%__MODULE__{}), do: true
@doc "Check if comment is top-level (no parent)."
def top_level?(%__MODULE__{parent_uuid: nil}), do: true
def top_level?(%__MODULE__{}), do: false
@doc "Check if comment is published."
def published?(%__MODULE__{status: "published"}), do: true
def published?(_), do: false
@doc "Check if comment is deleted."
def deleted?(%__MODULE__{status: "deleted"}), do: true
def deleted?(_), do: false
end