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PORails 4 Strong Params has_many with JSON
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  1. PORails 4 Strong Params has_many with JSON
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    copied!<p>I'm attempting to pass json up on the client side and have rails take care of handling the object creation.</p> <p>Here are my models:</p> <pre><code>class Order &lt; ActiveRecord::Base has_many :order_items, :autosave =&gt; true belongs_to :menu_session end class OrderItem &lt; ActiveRecord::Base belongs_to :order has_one :menu_item end </code></pre> <p>Controller</p> <pre><code>class OrderController &lt; ApplicationController #POST /order/create def create @order = Order.new(order_params) @order.save end private def order_params params.require(:order).permit(:comments, :menu_session_id, :order_items =&gt; [:menu_item_id]) end end </code></pre> <p>The json data:</p> <pre><code>{'order': {'comments': 'none', 'menu_session_id': '9', 'order_items':[{'menu_item_id': '5'}, {'menu_item_id': '5'}]}}; </code></pre> <p>The javascript</p> <pre><code>var data = {}; data.order = {'comments': 'none', 'menu_session_id': '9', 'order_items':[{'menu_item_id': '5'}, {'menu_item_id': '5'}]}; $.post('http://localhost:3000/order/create', orders, function(){}, 'json'); </code></pre> <p>Finally, the error log:</p> <pre><code>Started POST "/order/create" for 127.0.0.1 at 2013-07-10 22:30:36 -0400 Processing by OrderController#create as JSON Parameters: {"order"=&gt;{"comments"=&gt;"none", "menu_session_id"=&gt;"9", "order_items"=&gt;{"0"=&gt;{"menu_item_id"=&gt;"5"}, "1"=&gt;{"menu_item_id"=&gt;"5"}}}} Completed 500 Internal Server Error in 52ms ActiveRecord::AssociationTypeMismatch (OrderItem(#28109220) expected, got Array(#16050620)): app/controllers/order_controller.rb:5:in `create' </code></pre> <p>Clearly, either my json is messed up or the ruby .permit is wrong. However, I've been playing with variations of this for a while now and cannot get it to work. The official documentation doesn't seem to venture into this, and every example I have found here deals with forms. </p> <p>Anyone have any idea what is going on? I can't be the first to try this approach.</p> <hr> <p><strong>UPDATE:</strong></p> <p>Worked around it by making the following changes:</p> <pre><code>class OrderController &lt; ApplicationController #POST /order/create def create @order = Order.new(order_params) order_items = order_item_params order_items.each do |item| @order.order_items &lt;&lt; OrderItem.new(menu_item_id: item) end @order.save end private def order_params params.require(:order).permit(:comments, :menu_session_id) end def order_item_params params.require(:order_items) end end </code></pre> <p>json: <code>{"order":{"comments":"none","menu_session_id":"9"},"order_items":["5","5"]}</code></p> <p>I don't think this would be the best way to do it, so I'm going to leave the question unanswered for now in hopes there is a best practice.</p>
 

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