Introduce group posts

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20200708080516_create_posts.exs

@@ -0,0 +1,47 @@
+defmodule Mobilizon.Repo.Migrations.CreatePosts do
+  use Ecto.Migration
+
+  alias Mobilizon.Posts.PostVisibility
+
+  def up do
+    PostVisibility.create_type()
+
+    create table(:posts, primary_key: false) do
+      add(:id, :uuid, primary_key: true)
+      add(:title, :string)
+      add(:slug, :string)
+      add(:url, :string)
+      add(:body, :text)
+      add(:draft, :boolean, default: false, null: false)
+      add(:local, :boolean, default: true, null: false)
+      add(:visibility, PostVisibility.type(), default: "public")
+      add(:publish_at, :utc_datetime)
+      add(:author_id, references(:actors, on_delete: :delete_all))
+      add(:attributed_to_id, references(:actors, on_delete: :delete_all))
+      add(:picture_id, references(:pictures, on_delete: :delete_all))
+
+      timestamps()
+    end
+
+    create table(:posts_tags, primary_key: false) do
+      add(:post_id, references(:posts, on_delete: :delete_all, type: :uuid), primary_key: true)
+      add(:tag_id, references(:tags, on_delete: :delete_all), primary_key: true)
+    end
+
+    alter table(:actors) do
+      add(:posts_url, :string, null: true)
+      add(:events_url, :string, null: true)
+    end
+  end
+
+  def down do
+    drop(table(:posts_tags))
+    drop(table(:posts))
+    PostVisibility.drop_type()
+
+    alter table(:actors) do
+      remove(:posts_url, :string, null: true)
+      remove(:events_url, :string, null: true)
+    end
+  end
+end