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Improve projection in example to flatten picking a single field

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jos 2020-01-04 12:24:12 +01:00
parent ad430a3173
commit d12a5e7cf2
1 changed files with 10 additions and 6 deletions
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16
examples/23_custom_query_language.html
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@ -74,12 +74,16 @@
if (projection) { if (projection) {
// It is possible to make a util function "pickFlat" // It is possible to make a util function "pickFlat"
// and use that when building the query to make it more readable. // and use that when building the query to make it more readable.
const fields = projection.fields.map(field => { if (projection.fields.length > 1) {
const name = _.last(field.split('.')) const fields = projection.fields.map(field => {
return ` '${name}': _.get(item, '${field}')` const name = _.last(field.split('.'))
}) return ` '${name}': _.get(item, '${field}')`
})
query = `_.map(${query}, item => ({\n${fields.join(',\n')}})\n)` query = `_.map(${query}, item => ({\n${fields.join(',\n')}})\n)`
} else {
const field = projection.fields[0]
query = `_.map(${query}, item => _.get(item, '${field}'))`
}
} }
return query return query