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app/models/collection.rb

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+class Collection < ApplicationRecord
+  belongs_to :user
+end

db/migrate/20200320074850_create_collections.rb

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+class CreateCollections < ActiveRecord::Migration[5.2]
+  def change
+    create_table :collections do |t|
+      t.references :user, index: true
+      t.integer :container_id
+      t.string :container_type
+
+      t.timestamps
+    end
+
+    add_index :collections, [:container_type, :container_id]
+  end
+end

spec/models/collection_spec.rb

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+require 'rails_helper'
+
+RSpec.describe Collection, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end