Best in place

_post.html.erb

<%= best_in_place post, :post, type: :textarea, :path => post_path(post), :display_as => 'mk_statement', :sanitize => false,
:activator => ".edit_post_#{post.id}"%>

application.js

//= require best_in_place

Gemfile

gem 'best_in_place'

post_controller.rb

respond_to do |format|
      if @post.update_attributes(params[:post])
        format.html { redirect_to(@post.project, :notice => 'Post was successfully updated.') }
        format.json { respond_with_bip(@post) }
      else
        format.html { render :action => "edit" }
        format.json { respond_with_bip(@post) }
      end
end

posts.js.coffee

jQuery ->
  $('.best_in_place').best_in_place()