Selecting a specific metafield for a product using Shopify API, Ruby on Rails

Question

In liquid templates this is achieved like so:

{{ product.metafields.book.author }}

Which returns the value of 'author' for it's key 'book'

I'm using Shopify API and Ruby on Rails and have successfully looped over each metafield for a given product:

In the controller:

@products = ShopifyAPI::Product.find(:all, :params => {:limit => 10})

In the view:

<% @products.metafields.each do |metafield| %>
<%= metafield.key %> : <%= metafield.value %>
<% end %>

This returns all of the metafields for a product, as expected. How do I return only those metafields matching a specific key i.e. 'book' from the example above?

Wallasey

Answer 1

This works:

ShopifyAPI::Metafield.find(:first,:params=>{:resource => "products", :resource_id => 94549954, :key => "book"}) 

Wallasey

Answer 2

# add metafield
product = ShopifyAPI::Product.find(product_id)
product.add_metafield(ShopifyAPI::Metafield.new({
   :description => 'Author of book',
   :namespace => 'book',
   :key => 'author',
   :value => 'Kurt Vonnegut',
   :value_type => 'string'
}))

# retrieve metafield
author = ShopifyAPI::Metafield.find(:first,:params=>{:resource => "products", :resource_id => product.id, :namespace => "book", :key => "author"}).value

More info: http://www.shopify.com/technology/3032322-new-feature-metafields

Consentient

Answer 3

This seems to do the trick:

<% product.metafields.each do |metafield| %>
    <% if metafield.key == "book" %>
        <%= metafield.key %>: <%= metafield.value %><br/>
    <% end %>
<% end %>

or

<% product.metafields.each do |metafield| %>
    <% if metafield.key.include?("book") %>
        <%= metafield.key %>: <%= metafield.value %><br/>
    <% else %>
<% end %>

Wallasey

I imagine this is better off in the controller, rather than the view. Any adice would be cool – Wallasey

You wouldn't use that code in the controller, as you are printing out the metafields, which is what you naturally do in the view – Rimbaud

Answer 4

ShopifyAPI::Metafield.find(:all,:params=>{:product_id => product.id, :key=> 'book'})

Col

Hi John, thanks for your answer. I'm having some trouble implementing this, would you mind elaborating on the code a little please? – Wallasey

This for me just returns an empty array. I've tried in IRB using minimal params i.e. ShopifyAPI::Metafield.find(:all,:params=>{:product_id => 94549896}) – Wallasey

This works: ShopifyAPI::Metafield.find(:first,:params=>{:resource => "products", :resource_id => 94549954, :key => "book"}) – Wallasey

Answer 5

You can get all metafields for a product

@product = ShopifyAPI::Product.find(params[:id])

After that, you can get its metafields

@metafields = @product.metafields

Or if you need just a specific metafield for that product

@metafield = ShopifyAPI::Product::Metafield.find(:all, where: {"product_id = ? AND metafield.key = ?", product.id, "book"})

Amplify