title: rails 6: no implicit conversion of String into Integer
body: <p>I've been trying to learn ruby(2.6.3) on rails(6.0.1) by following a project to make an Instagram clone.
  When I try to create a new post I get "no implicit conversion of String into Integer app/controllers/posts_controller.rb:8:in `create' ". I'm confused because I do not see a string to int so i'm wondering if it is something i'm missing with ruby. I've tried updating my gem versions and also tried adding the "strong_parameters" gem but that did not seem to fix my problem. Thank you for any insight as to what i'm doing wrong</p>
  
  <p>Post_controller.rb</p>
  
  <pre><code>class PostsController &lt; ApplicationController
  
  def new
   @post = Post.new
  end
  
  def create
   @post = Post.new(post_params)
  
  if @post.save
    redirect_to dashboard_path, flash: {success: "Post was created successfully!"}
  else
    redirect_to new_post_path, flash: {danger: "Post failed to save!"}
   end
  end
  
  def show
  end
  
  private
  
  def post_params
    params.require(:post).permit(:image, :image_cache)
  end
  end
  </code></pre>
  
  <p>Posts table migrate</p>
  
  <pre><code>class CreatePosts &lt; ActiveRecord::Migration[6.0]
  def change
  create_table :posts do |t|
    t.string :image
    t.boolean :active
    t.references :account
    t.timestamps
    end
  end
  end
  </code></pre>
  
  <p>Post Model</p>
  
  <pre><code>class Post &lt; ApplicationRecord
    mount_uploader :image, ImageUploader
  end
  </code></pre>
  
  <p>Post table schema</p>
  
  <pre><code>create_table "posts", force: :cascade do |t|
  t.string "image"
  t.boolean "active"
  t.bigint "account_id"
  t.datetime "created_at", precision: 6, null: false
  t.datetime "updated_at", precision: 6, null: false
  t.index ["account_id"], name: "index_posts_on_account_id"
  end
  </code></pre>
  
  <p>Full stack trace</p>
  
  <pre><code>carrierwave (2.0.2) lib/carrierwave/sanitized_file.rb:312:in `chmod'
  carrierwave (2.0.2) lib/carrierwave/sanitized_file.rb:312:in `chmod!'
  carrierwave (2.0.2) lib/carrierwave/sanitized_file.rb:220:in `copy_to'
  carrierwave (2.0.2) lib/carrierwave/uploader/cache.rb:141:in `cache!'
  carrierwave (2.0.2) lib/carrierwave/mounter.rb:63:in `block (2 levels) in cache'
  carrierwave (2.0.2) lib/carrierwave/mounter.rb:176:in `handle_error'
  carrierwave (2.0.2) lib/carrierwave/mounter.rb:47:in `block in cache'
  carrierwave (2.0.2) lib/carrierwave/mounter.rb:46:in `map'
  carrierwave (2.0.2) lib/carrierwave/mounter.rb:46:in `cache'
  carrierwave (2.0.2) lib/carrierwave/mount.rb:146:in `image='
  carrierwave (2.0.2) lib/carrierwave/mount.rb:373:in `image='
  carrierwave (2.0.2) lib/carrierwave/orm/activerecord.rb:75:in `image='
  activemodel (6.0.1) lib/active_model/attribute_assignment.rb:51:in `public_send'
  activemodel (6.0.1) lib/active_model/attribute_assignment.rb:51:in `_assign_attribute'
  activemodel (6.0.1) lib/active_model/attribute_assignment.rb:44:in `block in _assign_attributes'
  activemodel (6.0.1) lib/active_model/attribute_assignment.rb:43:in `each'
  activemodel (6.0.1) lib/active_model/attribute_assignment.rb:43:in `_assign_attributes'
  activerecord (6.0.1) lib/active_record/attribute_assignment.rb:22:in `_assign_attributes'
  activemodel (6.0.1) lib/active_model/attribute_assignment.rb:35:in `assign_attributes'
  activerecord (6.0.1) lib/active_record/core.rb:326:in `initialize'
  activerecord (6.0.1) lib/active_record/inheritance.rb:70:in `new'
  activerecord (6.0.1) lib/active_record/inheritance.rb:70:in `new'
  app/controllers/posts_controller.rb:8:in `create'
  actionpack (6.0.1) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
  actionpack (6.0.1) lib/abstract_controller/base.rb:196:in `process_action'
  actionpack (6.0.1) lib/action_controller/metal/rendering.rb:30:in `process_action'
  actionpack (6.0.1) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
  activesupport (6.0.1) lib/active_support/callbacks.rb:135:in `run_callbacks'
  actionpack (6.0.1) lib/abstract_controller/callbacks.rb:41:in `process_action'
  actionpack (6.0.1) lib/action_controller/metal/rescue.rb:22:in `process_action'
  actionpack (6.0.1) lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
  activesupport (6.0.1) lib/active_support/notifications.rb:180:in `block in instrument'
  activesupport (6.0.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
  activesupport (6.0.1) lib/active_support/notifications.rb:180:in `instrument'
  actionpack (6.0.1) lib/action_controller/metal/instrumentation.rb:32:in `process_action'
  actionpack (6.0.1) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
  activerecord (6.0.1) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
  actionpack (6.0.1) lib/abstract_controller/base.rb:136:in `process'
  actionview (6.0.1) lib/action_view/rendering.rb:39:in `process'
  actionpack (6.0.1) lib/action_controller/metal.rb:191:in `dispatch'
  actionpack (6.0.1) lib/action_controller/metal.rb:252:in `dispatch'
  actionpack (6.0.1) lib/action_dispatch/routing/route_set.rb:51:in `dispatch'
  actionpack (6.0.1) lib/action_dispatch/routing/route_set.rb:33:in `serve'
  actionpack (6.0.1) lib/action_dispatch/journey/router.rb:49:in `block in serve'
  actionpack (6.0.1) lib/action_dispatch/journey/router.rb:32:in `each'
  actionpack (6.0.1) lib/action_dispatch/journey/router.rb:32:in `serve'
  actionpack (6.0.1) lib/action_dispatch/routing/route_set.rb:837:in `call'
  warden (1.2.8) lib/warden/manager.rb:36:in `block in call'
  warden (1.2.8) lib/warden/manager.rb:34:in `catch'
  warden (1.2.8) lib/warden/manager.rb:34:in `call'
  rack (2.0.7) lib/rack/tempfile_reaper.rb:15:in `call'
  rack (2.0.7) lib/rack/etag.rb:25:in `call'
  rack (2.0.7) lib/rack/conditional_get.rb:38:in `call'
  rack (2.0.7) lib/rack/head.rb:12:in `call'
  actionpack (6.0.1) lib/action_dispatch/http/content_security_policy.rb:18:in `call'
  rack (2.0.7) lib/rack/session/abstract/id.rb:232:in `context'
  rack (2.0.7) lib/rack/session/abstract/id.rb:226:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/cookies.rb:648:in `call'
  activerecord (6.0.1) lib/active_record/migration.rb:567:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
  activesupport (6.0.1) lib/active_support/callbacks.rb:101:in `run_callbacks'
  actionpack (6.0.1) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/actionable_exceptions.rb:17:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
  web-console (4.0.1) lib/web_console/middleware.rb:132:in `call_app'
  web-console (4.0.1) lib/web_console/middleware.rb:28:in `block in call'
  web-console (4.0.1) lib/web_console/middleware.rb:17:in `catch'
  web-console (4.0.1) lib/web_console/middleware.rb:17:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
  railties (6.0.1) lib/rails/rack/logger.rb:38:in `call_app'
  railties (6.0.1) lib/rails/rack/logger.rb:26:in `block in call'
  activesupport (6.0.1) lib/active_support/tagged_logging.rb:80:in `block in tagged'
  activesupport (6.0.1) lib/active_support/tagged_logging.rb:28:in `tagged'
  activesupport (6.0.1) lib/active_support/tagged_logging.rb:80:in `tagged'
  railties (6.0.1) lib/rails/rack/logger.rb:26:in `call'
  sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/request_id.rb:27:in `call'
  rack (2.0.7) lib/rack/method_override.rb:22:in `call'
  rack (2.0.7) lib/rack/runtime.rb:22:in `call'
  activesupport (6.0.1) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/static.rb:126:in `call'
  rack (2.0.7) lib/rack/sendfile.rb:111:in `call'
  actionpack (6.0.1) lib/action_dispatch/middleware/host_authorization.rb:83:in `call'
  webpacker (4.2.0) lib/webpacker/dev_server_proxy.rb:23:in `perform_request'
  rack-proxy (0.6.5) lib/rack/proxy.rb:57:in `call'
  railties (6.0.1) lib/rails/engine.rb:526:in `call'
  puma (4.3.1) lib/puma/configuration.rb:228:in `call'
  puma (4.3.1) lib/puma/server.rb:681:in `handle_request'
  puma (4.3.1) lib/puma/server.rb:472:in `process_client'
  puma (4.3.1) lib/puma/server.rb:328:in `block in run'
  puma (4.3.1) lib/puma/thread_pool.rb:134:in `block in spawn_thread' 
  </code></pre>
  
  <p>Carrierwave config</p>
  
  <p>CarrierWave.configure do |config| config.fog_credentials = { provider: 'AWS', aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'], aws_secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'], } config.storage = :fog config.permissions = "0666" config.cache_dir = "#{Rails.root}/tmp/" config.fog_directory = ENV['FOG_DIRECTORY'] config.fog_attributes = { 'Cache-Control' => "max-age=#{365.day.to_i}" }end</p>