/// <summary>
/// Generalized Queryable search that supports filtering and paging
/// </summary>
/// <param name="filter">filter expression</param>
/// <param name="pageRequest">page request</param>
/// <param name="ct">cancellation token</param>
/// <returns>search results</returns>
protected async Task <IPageResult <TModel> > OnGeneralizedSearch(Expression <Func <TModel, bool> > filter, IPageRequest pageRequest, CancellationToken ct)
{
var result = new PageResult <TModel>
{
PageNumber = 1,
};
var query = this.OnQueryable(ct);
// add filter expression to query
if (filter != null)
{
var expression = this.DataMapper.MapExpression <Expression <Func <TEntity, bool> > >(filter);
query = query.Where(expression);
}
// add paging expression to query
if (pageRequest != null)
{
result.PageNumber = pageRequest.PageNumber;
query = query.Skip(pageRequest.SkipAmount())
.Take(pageRequest.TakeAmount());
if (pageRequest.IncludeTotalCount)
{
await this.CountEntityAsync(result, query, ct)
.ConfigureAwait(false);
}
}
var entitySet = query.ToList();
result.Items = this.OnConvert(entitySet);
return(result);
}
