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QueryExtensions.cs
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36 lines (28 loc) · 1.27 KB
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using Shuttle.Access.Query;
using Shuttle.Contract;
namespace Shuttle.Access;
public static class QueryExtensions
{
extension<TModel, TSpecification>(IQuery<TModel, TSpecification> query)
where TModel : class
where TSpecification : Specification<TSpecification>
{
public async Task<bool> ContainsAsync(TSpecification specification, CancellationToken cancellationToken = default)
{
ArgumentNullException.ThrowIfNull(query);
ArgumentNullException.ThrowIfNull(specification);
specification.WithMaximumRows(1);
return (await query.SearchAsync(specification, cancellationToken)).Any();
}
public async Task<TModel?> FindAsync(TSpecification specification, CancellationToken cancellationToken = default)
{
ArgumentNullException.ThrowIfNull(query);
ArgumentNullException.ThrowIfNull(specification);
specification.WithMaximumRows(2);
var results = (await query.SearchAsync(specification, cancellationToken)).ToList();
return results.Count > 1
? throw new ApplicationException($"Specification should return only a single result for '{typeof(TModel)}'.")
: results.FirstOrDefault();
}
}
}