How to Display Default Content with Optional Properties in Templates?

Showing Default Content with Optional Properties in Templates

In a template, you may encounter situations where you want to display default content for most cases but override it with specific values when a property is set. To achieve this without resorting to unnecessary boilerplate, follow this guide.

Understanding the Code Snippet

Your original code snippet attempts to check if the object is nil and apply default meta tags accordingly. However, using {{eq . nil}} checks for exact equality with nil, which is not ideal when dealing with empty values other than nil.

The provided solution employs a more comprehensive approach:

{{if not .}}
   output when . is nil or otherwise empty including
     false, 0, and any array, slice, map, or string of length zero
{{else if eq .MetaValue "some-x"}}
       // some-x case
{{else}} 
       // other case
{{end}}

Explanation

• {{if not .}}: This condition evaluates to true when the object is nil or empty.
• {{eq .MetaValue "some-x"}}: This condition checks if the MetaValue property is set to "some-x".
• {{else}}: This block executes when neither of the above conditions is met, indicating that the object is neither nil nor has a MetaValue of "some-x".

By utilizing this approach, you can efficiently handle default content for your templates while also supporting specific property overrides, without the need for excessive boilerplate code.

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