public static IObjectFieldDescriptor UseLimitOffsetPaging <TSchemaType>(
this IObjectFieldDescriptor descriptor)
where TSchemaType : class
{
descriptor
.Type <PaginationPayloadType <TSchemaType> >()
.Argument("pageIndex", a => a.Type <IntType>())
.Argument("pageSize", a => a.Type <IntType>())
.Use(next => async context =>
{
await next(context);
if (context.Result is IQueryable <TSchemaType> list)
{
var paginatedList = await PaginatedList <TSchemaType> .CreateAsync(list,
context.Argument <int>("pageIndex"), context.Argument <int>("pageSize"));
var result = new PaginationPayload <TSchemaType>(paginatedList.ToList(),
paginatedList.HasNextPage, paginatedList.HasPreviousPage);
context.Result = result;
}
});
return(descriptor);
}
public async Task <IActionResult> Get([FromQuery] int?offset, int?limit)
{
IActionResult response = Unauthorized();
if (CheckIsValidJwt())
{
// Data Payload
var employees = new List <EmployeesPayload>();
var resp = await _fireObj.GetEmployees();
var jsonString = resp.Content.ReadAsStringAsync().Result;
if (resp.StatusCode == HttpStatusCode.OK && (jsonString != "null" && jsonString != null))
{
var jObj = JObject.Parse(jsonString);
foreach (var item in jObj)
{
var emp = item.Value.ToObject <EmployeesPayload>();
var listTypes = new List <string>();
listTypes.Add("application/json");
emp.links = new EmployeesPayloadLinksDetail
{
rel = "Employee information of " + emp.Name + " " + emp.Surname,
href = Request.Scheme + "://" + Request.Host + Request.Path.Value + "/" + emp.Id,
action = "GET",
types = listTypes
};
if (emp.Status == true)
{
employees.Add(emp);
}
}
// Pagination Payload
var pTotal = employees.Count;
var pOffset = 0;
var pLimit = 0;
var pNext = 0;
var pPrev = 0;
var pFirst = 0;
var pLast = 0;
if ((offset != null && limit != null)) // With Pagination QueryString
{
pOffset = offset.Value;
if (offset >= 0 && limit >= 1)
{
employees = employees.OrderBy(u => u.Id).Skip(offset.Value).Take(limit.Value).ToList();
pLimit = limit.Value;
pNext = pOffset + pLimit >= pTotal ? pOffset : pOffset + pLimit;
pPrev = pOffset - pLimit < 0 ? 0 : pOffset - pLimit;
pLast = (((pTotal - 1) - pOffset) % pLimit) == 0 ? pTotal - 1 : (pTotal - 1) - (((pTotal - 1) - pOffset) % pLimit);
}
}
else // Without Pagination QueryString
{
pOffset = 0;
if (pTotal < DEFAULT_LIMIT)
{
employees = employees.OrderBy(u => u.Id).Skip(0).Take(pTotal).ToList();
pLimit = pTotal;
pNext = 0;
pPrev = 0;
pLast = 0;
}
else
{
employees = employees.OrderBy(u => u.Id).Skip(0).Take(DEFAULT_LIMIT).ToList();
pLimit = DEFAULT_LIMIT;
pNext = pOffset + pLimit >= pTotal ? pOffset : pOffset + pLimit;
pPrev = 0;
pLast = (((pTotal - 1) - pOffset) % pLimit) == 0 ? pTotal - 1 : (pTotal - 1) - (((pTotal - 1) - pOffset) % pLimit);
}
}
var pagination = new PaginationPayload
{
offset = pOffset,
limit = pLimit,
total = pTotal,
links = new PaginationPayloadLinksDetail
{
next = Request.Scheme + "://" + Request.Host + Request.Path.Value + "?offset=" + pNext + "&limit=" + pLimit,
prev = Request.Scheme + "://" + Request.Host + Request.Path.Value + "?offset=" + pPrev + "&limit=" + pLimit,
first = Request.Scheme + "://" + Request.Host + Request.Path.Value + "?offset=" + pFirst + "&limit=" + pLimit,
last = Request.Scheme + "://" + Request.Host + Request.Path.Value + "?offset=" + pLast + "&limit=" + pLimit
}
};
response = Ok(new { employees, pagination });
}
else
{
response = CustomHttpResponse.Error(HttpStatusCode.NotFound, "UND002", "No Data Found.", "ไม่พบข้อมูล", "No data found.");
}
}
else
{
response = CustomHttpResponse.Error(HttpStatusCode.Unauthorized, "UND999", "Unauthorized, Invalid AccessToken.", "แอพฯ ของคุณไม่มีสิทธิ์ใช้งาน เนื่องจาก AccessToken ไม่ถูกต้อง หรือหมดอายุแล้ว, กรุณาติดต่อผู้ดูแลแอพฯ ของคุณ", "The AccessToken is invalid or expired, please contact your Application Administrator.");
}
return(response);
}
