Databases
StackOverflow2013
Postsdbo
POPassing an object through a link_to command to be referenced in the model#new page
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPassing an object through a link_to command to be referenced in the model#new page
    primarykey
    data
    text
    <p>I'm creating a basic loyalty card application, with model Merchant and Loyaltycard. In the merchant#show view I have this line</p> <pre><code>&lt;%=link_to 'New Loyalty card', new_loyaltycard_path(:merchant_id=&gt;1) %&gt; </code></pre> <p>I'm trying to pass the merchant ID to the loyaltycard#new view so it will be automatically selected as the merchant for that card. In loyaltycard#_form (which gets called by loyaltycard#new) I have the lines</p> <pre><code> &lt;%if @merchant%&gt; &lt;%= f.hidden_field :merchant_id, :value =&gt; @merchant.id %&gt; &lt;%else%&gt; &lt;div class="field"&gt; &lt;%= f.label :merchant_id %&gt;&lt;br /&gt; &lt;%= f.text_field :merchant_id %&gt; &lt;/div&gt; &lt;%end%&gt; </code></pre> <p>But I keep getting and error that says can't call id for class Nil. Is there a better way of doing this?</p> <p>Here is the controller code for loyaltycard</p> <pre><code> def new @loyaltycard = Loyaltycard.new respond_to do |format| format.html # new.html.erb format.json { render json: @loyaltycard } end end # GET /loyaltycards/1/edit def edit @loyaltycard = Loyaltycard.find(params[:id]) end # POST /loyaltycards # POST /loyaltycards.json def create @loyaltycard = Loyaltycard.new(params[:loyaltycard]) respond_to do |format| if @loyaltycard.save format.html { redirect_to @loyaltycard, notice: 'Loyaltycard was successfully created.' } format.json { render json: @loyaltycard, status: :created, location: @loyaltycard } else format.html { render action: "new" } format.json { render json: @loyaltycard.errors, status: :unprocessable_entity } end end end </code></pre> <p>The error is </p> <pre><code>Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USJohn
    1. USJohn
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWould you provide the error message and controller code? My bet is the problem is in controller? You should have sth like this in it: @merchant = Merchant.where(:id => merchant_id) and of course Merchant with id == 1 should exist in database.
      singulars
      1. POPassing an object through a link_to command to be referenced in the model#new page
      1. USMarek Kirejczyk
    2. COI added the info you requested.. Thanks for your help.
      singulars
      1. POPassing an object through a link_to command to be referenced in the model#new page
      1. USJohn
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload