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I'm trying to write a general use plugin for a calculation fieldtype that evaluates a twig expression (defined in the field settings) to display additional information about the current record in the CP (i.e. price * qty = amount). So far, everything is working perfectly — the generic expression 1 + 1 is evaluated and the result is properly displayed in the field.

The problem is, I don't actually know how to reference the current entry in the CP from within the CP via twig, to get access to the entry field values. Looking for something like {{ entry.price }} * {{ entry.qty }}, but don't know what to use instead of entry. Does anyone know a twig expression that I can use?

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As far as I know. The variable {{ entry }} is not available to custom field plugins through inheritance and must be explicitly set and returned as a variable in the getInputHtml method within the class definition file.

See this question for details on how to set this variable and things to be aware of.

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A bit hard to tell what's going on without any code examples, but if you're just looking for a way to grab an entry from your plugin, and you already have the ID of the entry, then EntriesService has a getEntryById() method available via craft()->entries->getEntryById() that your plugin can call.

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  • Thank you, but not exactly what I'm looking for.
    – Douglas McDonald
    Sep 15, 2014 at 18:10
  • The plugin is designed to just evaluate a twig expression, and output the result into the field. Within the plugin settings you can define the twig expression to be evaluated. Something like {{ entry.unitPrice * entry.quantity }}. The problem is {{entry}} does not seem to work in this context. I'm looking for a way to reference the current entry within the admin panel. I don't know if there is already a variable defined for this, or if I should create a custom 'entry' or 'id' variable in the plugin, or if I should parse the uri within the twig expression to retrieve the id.
    – Douglas McDonald
    Sep 15, 2014 at 18:27

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