How to Dynamically Customize Template Content Based on Object Availability in Go?

Customizing Template Content Based on Object Availability

In your template, you aim to display default meta tags unless a specific property is set, in which case different text should be shown. While using an anonymous struct to set property values for 90% of handlers is feasible, it introduces unnecessary complexity.

To achieve your desired functionality, you can employ the built-in not and empty functions in Go templates. Here's how:

{{if not .}}
   <!-- Output for nil or empty values, including false, 0, and any array, slice, map, or string of length zero -->
{{else if eq .MetaValue "some-x"}}
   <!-- Output for "some-x" property value -->
{{else}} 
   <!-- Output for non-empty values other than "some-x" -->
{{end}}

This code will first check if the .MetaValue is nil or empty. If it is, the first section will execute. If the MetaValue is not nil or empty, the second section will check if it equals "some-x." If it does, the second section will execute. Otherwise, the third section will execute.

Using this approach, you can avoid adding boilerplate code to handlers that currently pass nil and still dynamically control the content displayed in your template based on the presence or value of a property.

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