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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_group_assignment.ex
defmodule PhoenixKit.Modules.Posts.PostGroupAssignment do
@moduledoc """
Junction schema for post-group assignments.
Many-to-many relationship between posts and groups. A post can be in multiple groups,
and a group can contain multiple posts. Position allows manual ordering within each group.
## Fields
- `post_id` - Reference to the post
- `group_id` - Reference to the group
- `position` - Display order within the group (0, 1, 2, etc.)
## Examples
# First post in group
%PostGroupAssignment{
post_id: "018e3c4a-9f6b-7890-abcd-ef1234567890",
group_id: "018e3c4a-1234-5678-abcd-ef1234567890",
position: 0
}
# Second post in group
%PostGroupAssignment{
post_id: "018e3c4a-5678-1234-abcd-ef1234567890",
group_id: "018e3c4a-1234-5678-abcd-ef1234567890",
position: 1
}
"""
use Ecto.Schema
import Ecto.Changeset
@primary_key false
@type t :: %__MODULE__{
post_id: UUIDv7.t(),
group_id: UUIDv7.t(),
position: integer(),
post: PhoenixKit.Modules.Posts.Post.t() | Ecto.Association.NotLoaded.t(),
group: PhoenixKit.Modules.Posts.PostGroup.t() | Ecto.Association.NotLoaded.t(),
inserted_at: NaiveDateTime.t() | nil,
updated_at: NaiveDateTime.t() | nil
}
schema "phoenix_kit_post_group_assignments" do
field :position, :integer, default: 0
belongs_to :post, PhoenixKit.Modules.Posts.Post, type: UUIDv7, primary_key: true
belongs_to :group, PhoenixKit.Modules.Posts.PostGroup, type: UUIDv7, primary_key: true
timestamps(type: :naive_datetime)
end
@doc """
Changeset for creating a post-group assignment.
## Required Fields
- `post_id` - Reference to post
- `group_id` - Reference to group
## Validation Rules
- Position must be >= 0
- Unique constraint on (post_id, group_id) - post can't be in same group twice
"""
def changeset(assignment, attrs) do
assignment
|> cast(attrs, [:post_id, :group_id, :position])
|> validate_required([:post_id, :group_id])
|> validate_number(:position, greater_than_or_equal_to: 0)
|> foreign_key_constraint(:post_id)
|> foreign_key_constraint(:group_id)
|> unique_constraint([:post_id, :group_id],
name: :phoenix_kit_post_group_assignments_post_id_group_id_index,
message: "post already in this group"
)
end
end