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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/block.ex
defmodule PhoenixKit.Modules.Connections.Block do
@moduledoc """
Schema for user blocking relationships.
Represents a one-way block where one user blocks another.
Blocking prevents all interaction between users.
## Fields
- `blocker_id` - User who initiated the block
- `blocked_id` - User who is blocked
- `reason` - Optional reason for the block (visible to admins)
- `inserted_at` - When the block was created
## Examples
# User A blocks User B
%Block{
id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
blocker_id: 1,
blocked_id: 2,
reason: "Spam",
inserted_at: ~N[2025-01-15 10:30:00]
}
## Business Rules
- Cannot block yourself
- Blocking removes any existing follows between the users
- Blocking removes any existing connections between the users
- Blocked users cannot follow, connect, or view the blocker's profile
- Blocking is one-way (A blocks B doesn't mean B blocks A)
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key {:id, UUIDv7, autogenerate: true}
@type t :: %__MODULE__{
id: UUIDv7.t() | nil,
blocker_id: integer(),
blocked_id: integer(),
reason: String.t() | nil,
blocker: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t(),
blocked: PhoenixKit.Users.Auth.User.t() | Ecto.Association.NotLoaded.t(),
inserted_at: NaiveDateTime.t() | nil
}
schema "phoenix_kit_user_blocks" do
belongs_to :blocker, PhoenixKit.Users.Auth.User, type: :integer
belongs_to :blocked, PhoenixKit.Users.Auth.User, type: :integer
field :reason, :string
field :inserted_at, :naive_datetime
end
@doc """
Changeset for creating a block.
## Required Fields
- `blocker_id` - The user who is blocking
- `blocked_id` - The user being blocked
## Optional Fields
- `reason` - Why the user was blocked
## Validation Rules
- Both user IDs are required
- Cannot block yourself
- Unique constraint on (blocker_id, blocked_id) pair
"""
def changeset(block, attrs) do
block
|> cast(attrs, [:blocker_id, :blocked_id, :reason])
|> validate_required([:blocker_id, :blocked_id])
|> validate_length(:reason, max: 500)
|> validate_not_self_block()
|> put_inserted_at()
|> foreign_key_constraint(:blocker_id)
|> foreign_key_constraint(:blocked_id)
|> unique_constraint([:blocker_id, :blocked_id],
name: :phoenix_kit_user_blocks_unique_idx,
message: "user is already blocked"
)
end
defp validate_not_self_block(changeset) do
blocker_id = get_field(changeset, :blocker_id)
blocked_id = get_field(changeset, :blocked_id)
if blocker_id && blocked_id && blocker_id == blocked_id do
add_error(changeset, :blocked_id, "cannot block 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