First timer tag script (publiclab#4878)

* First timer tag script

* migration for attaching first-time-poster

* change migration bump version to 5.1

* Update schema.rb.example

db/migrate/20190301075323_add_first_tag_poster.rb

@@ -0,0 +1,14 @@
+class AddFirstTagPoster < ActiveRecord::Migration[5.1]
+  def find_and_update
+    User.joins(:node).where('node.status = ?', 1).each do |user|
+      if user.nodes.present?
+        node = user.nodes.first
+        node.add_tag('first-time-post', user)
+      end
+    end
+  end
+
+  def up
+    find_and_update
+  end
+end

db/schema.rb.example

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_01_04_173959) do
+ActiveRecord::Schema.define(version: 2019_03_01_075323) do
 
   create_table "answer_selections", force: true do |t|
     t.integer "user_id"