How to use the only function in only
To help you get started, we’ve selected a few only examples, based on popular ways it is used in public projects.
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ElementsProject / nanopos / src / app.js View on Github 
: null
if (!item) return res.sendStatus(404)
const metadata = { source: 'nanopos', item: req.body.item }
if (item.metadata) Object.assign(metadata, item.metadata)
const inv = await charge.invoice({
amount: item.price
, currency: item.price ? app.settings.currency : null
, description: `${ app.settings.title }${ item.title ? ': ' + item.title : '' }`
, expiry: 599
, metadata
})
res.send(only(inv, 'id payreq msatoshi quoted_currency quoted_amount expires_at'))
})) .map(item => only(item, [
"holiday",
"holidayRegion",
"name",
"type",
"startDate",
"endDate",
"noEnd",
"repeat",
"repeatCount",
"repeatInterval",
"repeatPeriod"].join(" ")))
}).then(res => { data: param.map(item => only(item, "dayOfWeek endTime startTime"))
}).then(res => {
