Altera CLI 0.3.0: Individual field selection for exports

Altera CLI 0.3.0 gives you more granular control over your exports with individual field selection.

🚀 What’s New

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• Individual field selection – prefix any field name with + to export only the columns you need (e.g., products:+id,+handle,+title).
• Mixed selection – combine field groups with individual fields in the same export (e.g., products:general,+metafield_custom_sizing).
• --list-fields option – discover all available fields for any resource, organized by field group.

🔧 Improvements

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• Flexible syntax – existing field group commands continue to work unchanged; the new + prefix is additive.
• Clear validation – invalid field names now show a helpful error message with a suggestion to use --list-fields.