private IQueryable <TResource> FilterById <TResource>(string id, IResourceTypeRegistration resourceTypeRegistration,
params Expression <Func <TResource, object> >[] includes) where TResource : class
{
var param = Expression.Parameter(typeof(TResource));
var filterByIdExpression = resourceTypeRegistration.GetFilterByIdExpression(param, id);
var predicate = Expression.Lambda <Func <TResource, bool> >(filterByIdExpression, param);
return(Filter(predicate, includes));
}
private IQueryable <TResource> FilterById <TResource>(string id,
IResourceTypeRegistration resourceTypeRegistration) where TResource : class
{
var param = Expression.Parameter(typeof(TResource));
var filterByIdExpression = resourceTypeRegistration.GetFilterByIdExpression(param, id);
var predicate = Expression.Lambda <Func <TResource, bool> >(filterByIdExpression, param);
IQueryable <TResource> query = _dbContext.Set <TResource>();
return(query.Where(predicate));
}
/// <summary>
/// Gets a record by ID
/// </summary>
protected async Task <TRecord> GetExistingRecordGeneric <TRecord>(IResourceTypeRegistration registration,
string id, ResourceTypeRelationship[] relationshipsToInclude, CancellationToken cancellationToken) where TRecord : class
{
var param = Expression.Parameter(registration.Type);
var filterExpression = registration.GetFilterByIdExpression(param, id);
var lambda = Expression.Lambda <Func <TRecord, bool> >(filterExpression, param);
var query = _dbContext.Set <TRecord>().AsQueryable()
.Where(lambda);
if (relationshipsToInclude != null)
{
query = relationshipsToInclude.Aggregate(query,
(current, resourceTypeRelationship) => current.Include(resourceTypeRelationship.Property.Name));
}
return(await query.FirstOrDefaultAsync(cancellationToken));
}
