blocks|key|2808326|text|这似乎起了作用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2808327|<%25+product.metafields.each+do+%7Cmetafield%7C+%25>
++++<%25+if+metafield.key+==+"book"+%25>
++++++++<%25=+metafield.key+%25>:+<%25=+metafield.value+%25> 
++++<%25+end+%25>
<%25+end+%25>|code-block|syntax|javascript|2808328|或|2808329|<%25+product.metafields.each+do+%7Cmetafield%7C+%25>
++++<%25+if+metafield.key.include?("book")+%25>
++++++++<%25=+metafield.key+%25>:+<%25=+metafield.value+%25> 
++++<%25+else+%25>
<%25+end+%25>|2808330|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This seems to do the trick:

<pre><code>&lt;% product.metafields.each do |metafield| %&gt;
 &lt;% if metafield.key == "book" %&gt;
 &lt;%= metafield.key %&gt;: &lt;%= metafield.value %&gt;&lt;br/&gt;
 &lt;% end %&gt;
&lt;% end %&gt;
</code></pre>

or

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

blocks|key|2808337|text|ShopifyAPI::Metafield.find(:all,:params=>{:product_id+=>+product.id,+:key=>+'book'})|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2808338|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>ShopifyAPI::Metafield.find(:all,:params=&gt;{:product_id =&gt; product.id, :key=&gt; 'book'})
</code></pre>

blocks|key|2808343|text|这样做是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2808344|ShopifyAPI::Metafield.find(:first,:params=>{:resource+=>+"products",+:resource_id+=>+94549954,+:key+=>+"book"})+|code-block|syntax|javascript|2808345|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This works: 

<pre><code>ShopifyAPI::Metafield.find(:first,:params=&gt;{:resource =&gt; "products", :resource_id =&gt; 94549954, :key =&gt; "book"}) 
</code></pre>

blocks|key|2808362|text|#+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|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2808363|更多信息：http://www.shopify.com/technology/3032322-new-feature-metafields|unstyled|offset|length|2808364|entityMap|0|LINK|mutability|MUTABLE|url|http://www.shopify.com/technology/3032322-new-feature-metafields^0|0|5|1S|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

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

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

More info: <a href="http://www.shopify.com/technology/3032322-new-feature-metafields" rel="noreferrer">http://www.shopify.com/technology/3032322-new-feature-metafields</a>

blocks|key|2789014|text|您可以获得产品的所有元字段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2789015|@product+=+ShopifyAPI::Product.find(params[:id])|code-block|syntax|javascript|2789016|在此之后，您可以获得它的元字段。|2789017|@metafields+=+@product.metafields|2789018|或者，如果您只需要为该产品提供特定的元字段。|2789019|@metafield+=+ShopifyAPI::Product::Metafield.find(:all,+where:+{"product_id+=+?+AND+metafield.key+=+?",+product.id,+"book"})|2789020|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You can get all metafields for a product 

<pre><code>@product = ShopifyAPI::Product.find(params[:id])
</code></pre>

After that, you can get its metafields

<pre><code>@metafields = @product.metafields
</code></pre>

Or if you need just a specific metafield for that product

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

In liquid templates this is achieved like so:

<pre><code>{{ product.metafields.book.author }}
</code></pre>

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:

<pre><code>@products = ShopifyAPI::Product.find(:all, :params =&gt; {:limit =&gt; 10})
</code></pre>

In the view:

<pre><code>&lt;% @products.metafields.each do |metafield| %&gt;
&lt;%= metafield.key %&gt; : &lt;%= metafield.value %&gt;
&lt;% end %&gt;
</code></pre>

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?

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

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在液体模板中，这是这样实现的：{{ product.metafields.book.author }}它返回“作者”的值，因为它是关键的“书”。我使用了Shopify API和Rails，并成功地为给定的产品遍历了每个元字段：控制器中的：@products = ShopifyAPI::Product.find(:all...

问使用Shopify API，Rails为产品选择特定的元字段
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问使用Shopify API，Rails为产品选择特定的元字段EN