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    <p>I think that using a has_many :through relationship would fit well with this problem: a user can have many items through bids.</p> <p>A) Each item page would have a form that updates the bid instance for that specific item. The form would have one field: the amount of the bid the user wishes to place.</p> <p>In order to solve your first problem, each time the bid is updated you do the following:</p> <ol> <li>Get the previous user id and add to its budget the old price that the bid had (this would return their money).</li> <li>Update the bid instance with the current user_id and the newly placed bid (all this data would be passed through the form)</li> <li>Decrease the new user's budget with the bid he placed.</li> </ol> <p>B) I think that there is no need to update the item's price because keeping the item's original price is important. Thus, instead of comparing a newly placed bid with the item's price, you would compare it with the last placed bid.</p> <p>If you insist in updating the item's price, its rather easy. You would find the Item instance using your item_id stored in the bid instance and then you would simply update its price attribute with the newly placed bid.</p> <p><strong>EDIT</strong></p> <p>You can use the following code (not tested) as a starting point:</p> <p>For your Item show action, you do the following:</p> <pre><code>def show @item = Item.find(params[:id]) @bid = Bid.find_by_item_id(@item.id) end </code></pre> <p>In your show view, you would have a form like so:</p> <pre><code>&lt;%= form_for @bid do |f| &amp;&gt; &lt;%= f.label :bid_amount %&gt; &lt;%= f.text_field :amount %&gt; #etc.... &lt;%= f.submit "Submit" %&gt; &lt;% end %&gt; </code></pre> <p>This form should route your request to the Bid controller update action which should have something like this:</p> <pre><code>def update @bid = Bids.find(params[:id]) @item = Item.find(@bid.item_id) @old_user = User.find(@bid.user_id) @old_user.budget += @item.price + @bid.amount @new_user = User.find(params[:bid][:user_id]) @bid.user_id = @new_user.id @bid.amount = params[:bid][:amount] @new_user.budget -= @item.price + @bid.amount respond_to do |format| if @bid.save format.html { redirect_to @item, notice: 'Your item has been updated.'} else format.html { render action: 'new' } end end end </code></pre>
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    1. POAuction site in rails and working with bids
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    1. COhow would I write the code for this? I add something like item.price + bid.amount in the bids controller but nothing happens.
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    2. COCan you edit your post to include your controller code?
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    3. COEdited the main post
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