file attachments in db

app/models/attachment.rb

@@ -0,0 +1,21 @@
+class Attachment < ApplicationRecord
+  belongs_to :attachable, polymorphic: true
+
+  has_attached_file :file,
+    styles: lambda { |a| 
+      a.instance.is_image? ? {
+        small: 'x200>',
+        medium: 'x300>', 
+        large: 'x400>'
+      } : {}
+    }
+
+  validates_attachment_content_type :file, :content_type => [
+    /\Aimage\/.*\Z/,
+    /\Avideo\/.*\Z/
+  ]
+
+  def is_image?
+    file.instance.file_content_type =~ %r(image)
+  end
+end

app/models/topic.rb

@@ -21,22 +21,7 @@ class Topic < ApplicationRecord
   validates :permission, presence: true
   validates :permission, inclusion: { in: Perm::ISSIONS.map(&:to_s) }
 
-  # This method associates the attribute ":image" with a file attachment
+  has_many :attachments, as: :attachable, dependent: :destroy
-  has_attached_file :image
-
-  # , styles: {
-  # thumb: '100x100>',
-  # square: '200x200#',
-  # medium: '300x300>'
-  # }
-
-  # Validate the attached image is image/jpg, image/png, etc
-  validates_attachment_content_type :image, content_type: /\Aimage\/.*\Z/
-
-  # This method associates the attribute ":image" with a file attachment
-  has_attached_file :audio
-  # Validate the attached audio is audio/wav, audio/mp3, etc
-  validates_attachment_content_type :audio, content_type: /\Aaudio\/.*\Z/
 
   def synapses
     synapses1.or(synapses2)

config/environments/development.rb

@@ -29,4 +29,7 @@ Rails.application.configure do
   # Expands the lines which load the assets
   config.assets.debug = false
   config.assets.quiet = true
+
+	# S3 file storage
+	config.paperclip_defaults = {} # store on local machine for dev
 end

db/migrate/20170122201451_create_attachments.rb

@@ -0,0 +1,12 @@
+class CreateAttachments < ActiveRecord::Migration[5.0]
+  def change
+    create_table :attachments do |t|
+      t.references :attachable, polymorphic: true
+      t.attachment :file
+      t.timestamps
+    end
+
+    remove_attachment :topics, :image
+    remove_attachment :topics, :audio
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161218183817) do
+ActiveRecord::Schema.define(version: 20170122201451) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -26,6 +26,18 @@ ActiveRecord::Schema.define(version: 20161218183817) do
     t.index ["user_id"], name: "index_access_requests_on_user_id", using: :btree
   end
 
+  create_table "attachments", force: :cascade do |t|
+    t.string   "attachable_type"
+    t.integer  "attachable_id"
+    t.string   "file_file_name"
+    t.string   "file_content_type"
+    t.integer  "file_file_size"
+    t.datetime "file_updated_at"
+    t.datetime "created_at",        null: false
+    t.datetime "updated_at",        null: false
+    t.index ["attachable_type", "attachable_id"], name: "index_attachments_on_attachable_type_and_attachable_id", using: :btree
+  end
+
   create_table "delayed_jobs", force: :cascade do |t|
     t.integer  "priority",   default: 0, null: false
     t.integer  "attempts",   default: 0, null: false
@@ -269,17 +281,9 @@ ActiveRecord::Schema.define(version: 20161218183817) do
     t.text     "link"
     t.integer  "user_id"
     t.integer  "metacode_id"
-    t.datetime "created_at",                     null: false
+    t.datetime "created_at",      null: false
-    t.datetime "updated_at",                     null: false
+    t.datetime "updated_at",      null: false
     t.text     "permission"
-    t.string   "image_file_name",    limit: 255
-    t.string   "image_content_type", limit: 255
-    t.integer  "image_file_size"
-    t.datetime "image_updated_at"
-    t.string   "audio_file_name",    limit: 255
-    t.string   "audio_content_type", limit: 255
-    t.integer  "audio_file_size"
-    t.datetime "audio_updated_at"
     t.integer  "defer_to_map_id"
     t.index ["metacode_id"], name: "index_topics_on_metacode_id", using: :btree
     t.index ["user_id"], name: "index_topics_on_user_id", using: :btree