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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_dislike.ex
defmodule PhoenixKit.Modules.Posts.PostDislike do
@moduledoc """
Schema for post dislikes.
Tracks which users have disliked which posts. Enforces one dislike per user per post.
## Fields
- `post_uuid` - Reference to the post
- `user_uuid` - Reference to the user who disliked
## Examples
# User dislikes a post
%PostDislike{
post_uuid: "018e3c4a-9f6b-7890-abcd-ef1234567890",
user_uuid: "018e3c4a-1234-5678-abcd-ef1234567890"
}
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key {:uuid, UUIDv7, autogenerate: true}
@type t :: %__MODULE__{
uuid: UUIDv7.t() | nil,
post_uuid: UUIDv7.t(),
user_uuid: UUIDv7.t() | nil,
post: PhoenixKit.Modules.Posts.Post.t() | Ecto.Association.NotLoaded.t(),
user: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t(),
inserted_at: DateTime.t() | nil,
updated_at: DateTime.t() | nil
}
schema "phoenix_kit_post_dislikes" do
belongs_to :post, PhoenixKit.Modules.Posts.Post,
foreign_key: :post_uuid,
references: :uuid,
type: UUIDv7
belongs_to :user, PhoenixKit.Users.Auth.User,
foreign_key: :user_uuid,
references: :uuid,
type: UUIDv7
timestamps(type: :utc_datetime)
end
@doc """
Changeset for creating a post dislike.
## Required Fields
- `post_uuid` - Reference to post
- `user_uuid` - Reference to user
## Validation Rules
- Unique constraint on (post_uuid, user_uuid) - one dislike per user per post
"""
def changeset(dislike, attrs) do
dislike
|> cast(attrs, [:post_uuid, :user_uuid])
|> validate_required([:post_uuid, :user_uuid])
|> foreign_key_constraint(:post_uuid)
|> foreign_key_constraint(:user_uuid)
|> unique_constraint([:post_uuid, :user_uuid],
name: :phoenix_kit_post_dislikes_post_uuid_user_uuid_index,
message: "you have already disliked this post"
)
end
end