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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/posts/post_like.ex
defmodule PhoenixKit.Posts.PostLike do
@moduledoc """
Schema for post likes.
Tracks which users have liked which posts. Enforces one like per user per post.
## Fields
- `post_id` - Reference to the post
- `user_id` - Reference to the user who liked
## Examples
# User likes a post
%PostLike{
post_id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
user_id: 42
}
"""
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(),
post: PhoenixKit.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_likes" do
belongs_to :post, PhoenixKit.Posts.Post, type: UUIDv7
belongs_to :user, PhoenixKit.Users.Auth.User, type: :integer
timestamps(type: :naive_datetime)
end
@doc """
Changeset for creating a post like.
## Required Fields
- `post_id` - Reference to post
- `user_id` - Reference to user
## Validation Rules
- Unique constraint on (post_id, user_id) - one like per user per post
"""
def changeset(like, attrs) do
like
|> cast(attrs, [:post_id, :user_id])
|> validate_required([:post_id, :user_id])
|> foreign_key_constraint(:post_id)
|> foreign_key_constraint(:user_id)
|> unique_constraint([:post_id, :user_id],
name: :phoenix_kit_post_likes_post_id_user_id_index,
message: "you have already liked this post"
)
end
end