private async Task <TResource> TryGetPrimaryResourceByIdAsync(TId id, TopFieldSelection fieldSelection, CancellationToken cancellationToken)
{
var primaryLayer = _queryLayerComposer.ComposeForGetById(id, _request.PrimaryResource, fieldSelection);
var primaryResources = await _repositoryAccessor.GetAsync <TResource>(primaryLayer, cancellationToken);
return(primaryResources.SingleOrDefault());
}
protected async Task <TResource> GetPrimaryResourceByIdAsync(TId id, TopFieldSelection fieldSelection, CancellationToken cancellationToken)
{
TResource primaryResource = await TryGetPrimaryResourceByIdAsync(id, fieldSelection, cancellationToken);
AssertPrimaryResourceExists(primaryResource);
return(primaryResource);
}
/// <inheritdoc />
public QueryLayer ComposeForGetById <TId>(TId id, ResourceContext resourceContext, TopFieldSelection fieldSelection)
{
ArgumentGuard.NotNull(resourceContext, nameof(resourceContext));
var idAttribute = GetIdAttribute(resourceContext);
var queryLayer = ComposeFromConstraints(resourceContext);
queryLayer.Sort = null;
queryLayer.Pagination = null;
queryLayer.Filter = CreateFilterByIds(id.AsArray(), idAttribute, queryLayer.Filter);
if (fieldSelection == TopFieldSelection.OnlyIdAttribute)
{
queryLayer.Projection = new Dictionary <ResourceFieldAttribute, QueryLayer>
{
[idAttribute] = null
};
}
else if (fieldSelection == TopFieldSelection.WithAllAttributes && queryLayer.Projection != null)
{
// Discard any top-level ?fields[]= or attribute exclusions from resource definition, because we need the full database row.
while (queryLayer.Projection.Any(pair => pair.Key is AttrAttribute))
{
queryLayer.Projection.Remove(queryLayer.Projection.First(pair => pair.Key is AttrAttribute));
}
}
return(queryLayer);
}
