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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/modules/posts/schemas/post_mention.ex
defmodule PhoenixKit.Modules.Posts.PostMention do
@moduledoc """
Schema for post mentions (tagged users).
Tags users related to a post - either as contributors who helped create it,
or mentions of people featured in the content.
## Mention Types
- `contributor` - User helped create/contribute to the post
- `mention` - User is mentioned/tagged in the post
## Fields
- `post_id` - Reference to the post
- `user_id` - Reference to the mentioned user
- `mention_type` - contributor/mention
## Examples
# Contributor mention
%PostMention{
post_id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
user_id: 42,
mention_type: "contributor"
}
# Regular mention
%PostMention{
post_id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
user_id: 15,
mention_type: "mention"
}
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key {:id, UUIDv7, autogenerate: true}
@type t :: %__MODULE__{
id: UUIDv7.t() | nil,
post_id: UUIDv7.t(),
user_id: integer(),
mention_type: String.t(),
post: PhoenixKit.Modules.Posts.Post.t() | Ecto.Association.NotLoaded.t(),
user: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t(),
inserted_at: NaiveDateTime.t() | nil,
updated_at: NaiveDateTime.t() | nil
}
schema "phoenix_kit_post_mentions" do
field :mention_type, :string, default: "mention"
belongs_to :post, PhoenixKit.Modules.Posts.Post, type: UUIDv7
belongs_to :user, PhoenixKit.Users.Auth.User, type: :integer
timestamps(type: :naive_datetime)
end
@doc """
Changeset for creating or updating a mention.
## Required Fields
- `post_id` - Reference to post
- `user_id` - Reference to mentioned user
- `mention_type` - Must be: "contributor" or "mention"
## Validation Rules
- Mention type must be valid (contributor/mention)
- Unique constraint on (post_id, user_id) - one mention per user per post
"""
def changeset(mention, attrs) do
mention
|> cast(attrs, [:post_id, :user_id, :mention_type])
|> validate_required([:post_id, :user_id, :mention_type])
|> validate_inclusion(:mention_type, ["contributor", "mention"])
|> foreign_key_constraint(:post_id)
|> foreign_key_constraint(:user_id)
|> unique_constraint([:post_id, :user_id],
name: :phoenix_kit_post_mentions_post_id_user_id_index,
message: "user already mentioned in this post"
)
end
@doc """
Check if mention is a contributor.
"""
def contributor?(%__MODULE__{mention_type: "contributor"}), do: true
def contributor?(_), do: false
end