//this methods helps to create a Url link to previous Resource
private string CreateAuthorsResourceUris(AuhtorResourceParameters auhtorResourceParameters, ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(Url.Link("GetAuthors",
new
{
PageNumber = auhtorResourceParameters.PageNumber - 1,
PageSize = auhtorResourceParameters.pageSize,
MainCategory = auhtorResourceParameters.mainCategory,
SearchQuery = auhtorResourceParameters.searchQuery
}));
case ResourceUriType.NextPage:
return(Url.Link("GetAuthors",
new
{
PageNumber = auhtorResourceParameters.PageNumber + 1,
PageSize = auhtorResourceParameters.pageSize,
MainCategory = auhtorResourceParameters.mainCategory,
SearchQuery = auhtorResourceParameters.searchQuery
}));
default:
return(Url.Link("GetAuthors",
new
{
PageNumber = auhtorResourceParameters.PageNumber,
PageSize = auhtorResourceParameters.pageSize,
MainCategory = auhtorResourceParameters.mainCategory,
SearchQuery = auhtorResourceParameters.searchQuery
}));
}
}
//get Auhtors wth mainCategory for filtering purpose and searching
public PagedList<Author> GetAuthors(AuhtorResourceParameters auhtorResourceParameters)
{
//throw new ArgumentNullException();
//if (string.IsNullOrWhiteSpace(auhtorResourceParameters.mainCategory) && string.IsNullOrWhiteSpace(auhtorResourceParameters.searchQuery))
//{
// return GetAuthors();
//}
var collections = _context.Authors as IQueryable<Author>;
if (!string.IsNullOrWhiteSpace(auhtorResourceParameters.mainCategory))
{
auhtorResourceParameters.mainCategory = auhtorResourceParameters.mainCategory.Trim();
collections = collections.Where(m => m.MainCategory == auhtorResourceParameters.mainCategory);
// return collections;
}
//implemenent searching
if (!string.IsNullOrWhiteSpace(auhtorResourceParameters.searchQuery))
{
auhtorResourceParameters.searchQuery = auhtorResourceParameters.searchQuery.Trim();
collections = collections.Where(m => m.MainCategory.Contains(auhtorResourceParameters.searchQuery)
|| m.FirstName.Contains(auhtorResourceParameters.searchQuery)
|| m.LastName.Contains(auhtorResourceParameters.searchQuery));
}
//apply the paging here before TOList is called
return PagedList<Author>.Create(collections, auhtorResourceParameters.PageNumber, auhtorResourceParameters.pageSize);
//return collections
// .Skip(auhtorResourceParameters.pageSize * (auhtorResourceParameters.PageNumber - 1)) // ths
// .Take(auhtorResourceParameters.pageSize)
// .ToList();
}
public ActionResult <IEnumerable <AuhtorDTO> > GetAuthors([FromQuery] AuhtorResourceParameters auhtorResourceParameters)
{
try
{
var GetAllAuthors = _courseLibrary.GetAuthors(auhtorResourceParameters);
//checking if there is a previous link, if there is calle dthe method, if not set to null
var previousPageLink = GetAllAuthors.HasPrevious ? CreateAuthorsResourceUris(auhtorResourceParameters, ResourceUriType.PreviousPage) : null;
var nextPageLink = GetAllAuthors.HasNext ? CreateAuthorsResourceUris(auhtorResourceParameters, ResourceUriType.NextPage) : null;
//then we create the MetaData we want to return to the user for guide
var paginationMetaData = new
{
totalCount = GetAllAuthors.Totalcount,
pageSize = GetAllAuthors.PageSize,
currentPage = GetAllAuthors.CurrentPage,
previousPageLink,
nextPageLink
};
//Adding to the header
Response.Headers.Add("X-Pagination", JsonSerializer.Serialize(paginationMetaData));
//using Automapper for cleaner code instead of select Query,(seee below)
//the return type first(destination), then the source
var auhtors = _mapper.Map <IEnumerable <AuhtorDTO> >(GetAllAuthors);
//var auhtors = GetAllAuthors
// .Select(a => new AuhtorDTO
// {
// ID = a.ID,
// Name =$"{a.FirstName} {a.LastName}",
// //An extention method written to grab the Authors age
// Age = DateTimeOffSetExtensions.GetCurrentAge(a.DateOfBirth),
// MainCategory = a.MainCategory,
// Courses = a.Courses,
// });
// return body format for the Api with right statusCode
return(Ok(new JsonResponse <AuhtorDTO>()
{
Success = true,
Results = auhtors
}));
}
catch (Exception ex)
{
//log ex
var path = HttpContext.Request.Path;
var query = HttpContext.Request.QueryString;
var pathAndQuery = path + query;
var messg = _courseLibrary.LogErrorMessage(ex.Message, pathAndQuery);
return(Ok(new JsonResponse <string>()
{
Success = false,
ErrorMessage = "Sorry, something just went wrong while processing your request! Pls Try Again."
}));
//return StatusCode(500, messg);
}
// return Ok(GetAllAuthors);
}
