osem-fcy/app/controllers/organizations_controller.rb

class OrganizationsController < ApplicationController
  load_and_authorize_resource :organization

  def index
    @organizations = Organization.all
  end

  def create
    @organization = Organization.new(organization_params)
    if @organization.save
      redirect_to organizations_path,
                  notice: 'Organization successfully created'
    else
      redirect_to new_organization_path,
                  error: @organization.errors.full_messages.join(', ')
    end
  end

  def new
    @organization = Organization.new
  end

  def edit; end

  def update
    if @organization.update_attributes(organization_params)
      redirect_to organizations_path,
                  notice: 'Organization successfully updated'
    else
      redirect_to edit_organization_path(@organization),
                  error: @organization.errors.full_messages.join(', ')
    end
  end

  private

  def organization_params
    params.require(:organization).permit(:name, :description, :picture)
  end
end