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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
Current section
Files
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Current section
Files
lib/modules/posts/schemas/post_media.ex
defmodule PhoenixKit.Modules.Posts.PostMedia do
@moduledoc """
Junction schema for post media attachments.
Links posts to uploaded files (images/videos) with ordering and captions.
Enables ordered image galleries in posts with per-image captions.
## Fields
- `post_id` - Reference to the post
- `file_id` - Reference to the uploaded file (PhoenixKit.Storage.File)
- `position` - Display order (1, 2, 3, etc.)
- `caption` - Optional caption/alt text for the image
## Examples
# First image in post
%PostMedia{
post_id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
file_id: "018e3c4a-1234-5678-abcd-ef1234567890",
position: 1,
caption: "Beautiful sunset at the beach"
}
# Second image
%PostMedia{
post_id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
file_id: "018e3c4a-5678-1234-abcd-ef1234567890",
position: 2,
caption: nil
}
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key {:id, UUIDv7, autogenerate: true}
@foreign_key_type UUIDv7
@type t :: %__MODULE__{
id: UUIDv7.t() | nil,
post_id: UUIDv7.t(),
file_id: UUIDv7.t(),
position: integer(),
caption: String.t() | nil,
post: PhoenixKit.Modules.Posts.Post.t() | Ecto.Association.NotLoaded.t(),
file: PhoenixKit.Modules.Storage.File.t() | Ecto.Association.NotLoaded.t(),
inserted_at: NaiveDateTime.t() | nil,
updated_at: NaiveDateTime.t() | nil
}
schema "phoenix_kit_post_media" do
field :position, :integer
field :caption, :string
belongs_to :post, PhoenixKit.Modules.Posts.Post
belongs_to :file, PhoenixKit.Modules.Storage.File
timestamps(type: :naive_datetime)
end
@doc """
Changeset for creating or updating post media.
## Required Fields
- `post_id` - Reference to post
- `file_id` - Reference to file
- `position` - Display order (must be positive)
## Validation Rules
- Position must be greater than 0
- Unique constraint on (post_id, position) - enforced at database level
"""
def changeset(media, attrs) do
media
|> cast(attrs, [:post_id, :file_id, :position, :caption])
|> validate_required([:post_id, :file_id, :position])
|> validate_number(:position, greater_than: 0)
|> foreign_key_constraint(:post_id)
|> foreign_key_constraint(:file_id)
|> unique_constraint([:post_id, :position],
name: :phoenix_kit_post_media_post_id_position_index,
message: "position already taken for this post"
)
end
end