This is the code used to replace a recipe on a page using ajax.

gistfile1.rb

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Link to Action in View:
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<%= link_to image_tag("refreshIcon.png"), replace_meal_queue_recipe_path(meal_queue_recipe), method: :post, remote: true %>

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Controller:
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class MealQueueRecipesController < ApplicationController
  # GET /meal_queue_recipes
  # GET /meal_queue_recipes.json
  
  def replace
    @mqr = MealQueueRecipe.find(params[:id])
    @old_mqr_id = @mqr.id
    
    # Save history
    current_user.history.set_status(@mqr, "replaced")
    
    @mqr.random_replace_recipe
    @mqr.save
    
    respond_to do |format|
      format.html { redirect_to home_url }
      format.js
    end
  end
...
end
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View returned by controller (replace.js.erb):
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// Swap out old meal queue recipe for the new one
$('#meal_queue_recipe_<%= @old_mqr_id %>').replaceWith('<%=j render @mqr %>')