Ruby on Rails Paperclip gem nested form problem with retention

  • Good day. I'm doing a little project, I'm faced with the problem of keeping pictures.

    My models:

    class Arendakvartir < ActiveRecord::Base

    has_many :attachments, dependent: :destroy
    accepts_nested_attributes_for :attachments
    validates_associated :attachments


    class Attachment < ActiveRecord::Base

    belongs_to :arendakvartir

    has_attached_file :image,
    :path => ":rails_root/public/images/:id/:filename",
    :url => "/images/:id/:filename",
    styles: { medium: "300x300>", thumb: "100x100>" }

    validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
    validates_attachment :image, presence: true
    validates_attachment_size :image, :less_than => 5.megabytes



    class ArendakvartirsController < ApplicationController

    def new
    @arenda =

    def show


    def create


    @arenda =
      respond_to do |format|
          flash[:positive] = "Объект сохранен успешно"
          format.html { redirect_to new_arendakvartir_path }
      respond_to do |format|
          flash[:negative] =  "Объект не был сохранен успешно"
          format.html { render action: 'new'}


    def arenda_params

    params.require(:arendakvartir).permit(:attachments_attributes =[:image]



    Proposal form:

    <%= nested_form_for(@arenda, :html =>  { :class => "ui form", :id => "create_new_arenda", :multipart => true }) do |t| %>

        &lt;%= render 'shared/errors', :obj =&gt; @arenda  %&gt;
          &lt;%= t.fields_for :attachments do |a| %&gt;
              &lt;%= a.file_field :image, :name =&gt; 'arendakvartir[attachments_attributes][][image]' %&gt;
          &lt;% end %&gt;

    <%= submit_tag("Добавить объект", :class => "ui huge olive button") %>

    <% end %>

    Ultimately, I'm getting a mistake in validating the Attachment model.

    In shape there are errors:

    Attachments image can't be blank
    Attachments is invalid

    Tell me where I'm wrong. My gemfile:

    source ''

    gem 'pg'

    Bundle edge Rails instead: gem 'rails', github: 'rails/rails'

    gem 'rails', '4.2.3'

    Use sqlite3 as the database for Active Record

    gem 'sqlite3'

    Use SCSS for stylesheets

    gem 'sass-rails', '~> 5.0'

    Use Uglifier as compressor for JavaScript assets

    gem 'uglifier', '>= 1.3.0'

    Use CoffeeScript for .coffee assets and views

    gem 'coffee-rails', '~> 4.1.0'

    See for more supported runtimes

    gem 'therubyracer', platforms: :ruby

    Use jquery as the JavaScript library

    gem 'jquery-rails'

    Turbolinks makes following links in your web application faster. Read more:

    gem 'turbolinks'

    Build JSON APIs with ease. Read more:

    gem 'jbuilder', '~> 2.0'

    bundle exec rake doc:rails generates the API under doc/api.

    gem 'sdoc', '~> 0.4.0', group: :doc
    gem 'paperclip', '~> 4.3'
    #gem 'rmagick', '~> 2.15', '>= 2.15.4'
    #Use ActiveModel has_secure_password
    gem 'bcrypt', '~> 3.1.7'
    gem "wysiwyg-rails"
    gem "font-awesome-rails"
    gem "nested_form"
    gem 'semantic-ui-sass', github: 'doabit/semantic-ui-sass'

    Use Unicorn as the app server

    gem 'unicorn'

    Use Capistrano for deployment

    gem 'capistrano-rails', group: :development

    group :development, :test do

    Call 'byebug' anywhere in the code to stop execution and get a debugger console

    gem 'byebug'

    gem 'pry'

    Access an IRB console on exception pages or by using <%= console %> in views

    gem 'web-console', '~> 2.0'

    Spring speeds up development by keeping your application running in the background. Read more:

    gem 'spring'

  • Hashmap with attributes makes sense in the following methods. model:

    • new (sighs)build for association)
    • create
    • assign_attributes
    • update_attributes (+ alas) update)

    Not at all. savewhich is responsible solely for recording the current status of the OBD facility.

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