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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/connections/follow.ex
defmodule PhoenixKit.Modules.Connections.Follow do
@moduledoc """
Schema for one-way follow relationships.
Represents a unidirectional relationship where one user follows another.
No consent is required from the followed user.
## Fields
- `follower_id` - User who is doing the following
- `followed_id` - User being followed
- `inserted_at` - When the follow was created
## Examples
# User A follows User B
%Follow{
id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
follower_id: 1,
followed_id: 2,
inserted_at: ~N[2025-01-15 10:30:00]
}
## Business Rules
- Cannot follow yourself
- Cannot follow if blocked (either direction)
- Duplicate follows are prevented by unique constraint
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key {:id, UUIDv7, autogenerate: true}
@type t :: %__MODULE__{
id: UUIDv7.t() | nil,
follower_id: integer(),
followed_id: integer(),
follower: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t(),
followed: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t(),
inserted_at: NaiveDateTime.t() | nil
}
schema "phoenix_kit_user_follows" do
belongs_to :follower, PhoenixKit.Users.Auth.User, type: :integer
belongs_to :followed, PhoenixKit.Users.Auth.User, type: :integer
field :inserted_at, :naive_datetime
end
@doc """
Changeset for creating a follow relationship.
## Required Fields
- `follower_id` - The user who is following
- `followed_id` - The user being followed
## Validation Rules
- Both user IDs are required
- Cannot follow yourself (follower_id != followed_id)
- Unique constraint on (follower_id, followed_id) pair
"""
def changeset(follow, attrs) do
follow
|> cast(attrs, [:follower_id, :followed_id])
|> validate_required([:follower_id, :followed_id])
|> validate_not_self_follow()
|> put_inserted_at()
|> foreign_key_constraint(:follower_id)
|> foreign_key_constraint(:followed_id)
|> unique_constraint([:follower_id, :followed_id],
name: :phoenix_kit_user_follows_unique_idx,
message: "already following this user"
)
end
defp validate_not_self_follow(changeset) do
follower_id = get_field(changeset, :follower_id)
followed_id = get_field(changeset, :followed_id)
if follower_id && followed_id && follower_id == followed_id do
add_error(changeset, :followed_id, "cannot follow yourself")
else
changeset
end
end
defp put_inserted_at(changeset) do
if get_field(changeset, :inserted_at) do
changeset
else
put_change(
changeset,
:inserted_at,
NaiveDateTime.utc_now() |> NaiveDateTime.truncate(:second)
)
end
end
end