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Type:
Sub-task
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Resolution: Unresolved
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Priority:
Unknown
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None
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Affects Version/s: None
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Component/s: Builder, Docs Examples
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None
How to use the aggregation builder to perform an actual aggregation
// code placeholder
How to create custom operator factories
use MongoDB\Builder\Expression;
use MongoDB\Builder\Expression\ResolvesToString;
use MongoDB\Builder\Pipeline;
use MongoDB\Builder\Stage;
function lcfirst(ResolvesToString|string $expression): ResolvesToString
{
return Expression::concat(
Expression::toLower(
Expression::substr($expression, 0, 1),
),
Expression::substr(
$expression,
Expression::subtract(
Expression::strLenCP(
$expression,
),
1,
),
-1,
),
);
}
$pipeline = new Pipeline(
Stage::project(
lowercaseName: lcfirst(
Expression::stringFieldPath('name'),
)
),
);