private IEnumerable <LinkDto> CreateLinksForCategories(
CategoriesResourceParameters categoriesResourceParameters,
bool hasNext, bool hasPrevious)
{
var links = new List <LinkDto>
{
new LinkDto(CreateCategoriesResourceUri(categoriesResourceParameters,
ResourceUriType.Current)
, "self", "GET")
};
if (hasNext)
{
links.Add(
new LinkDto(CreateCategoriesResourceUri(categoriesResourceParameters,
ResourceUriType.NextPage),
"nextPage", "GET"));
}
if (hasPrevious)
{
links.Add(
new LinkDto(CreateCategoriesResourceUri(categoriesResourceParameters,
ResourceUriType.PreviousPage),
"previousPage", "GET"));
}
return(links);
}
private string CreateCategoriesResourceUri(CategoriesResourceParameters categoriesResourceParameters,
ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(_urlHelper.Link("GetCategories",
new
{
fields = categoriesResourceParameters.Fields,
orderBy = categoriesResourceParameters.OrderBy,
searchQuery = categoriesResourceParameters.SearchQuery,
pageNumber = categoriesResourceParameters.PageIndex - 1,
pageSize = categoriesResourceParameters.PageSize
}));
case ResourceUriType.NextPage:
return(_urlHelper.Link("GetCategories",
new
{
fields = categoriesResourceParameters.Fields,
orderBy = categoriesResourceParameters.OrderBy,
searchQuery = categoriesResourceParameters.SearchQuery,
pageNumber = categoriesResourceParameters.PageIndex + 1,
pageSize = categoriesResourceParameters.PageSize
}));
case ResourceUriType.Current:
default:
return(_urlHelper.Link("GetCategories",
new
{
fields = categoriesResourceParameters.Fields,
orderBy = categoriesResourceParameters.OrderBy,
searchQuery = categoriesResourceParameters.SearchQuery,
pageNumber = categoriesResourceParameters.PageIndex,
pageSize = categoriesResourceParameters.PageSize
}));
}
}
public Task <PagedList <Category> > GetCategoriesAsync(CategoriesResourceParameters categoriesResourceParameters)
{
var collectionBeforePaging =
QueryableExtensions.ApplySort(_categoryRepository
.FindAllCategoriesPagedOf(categoriesResourceParameters.PageIndex,
categoriesResourceParameters.PageSize),
categoriesResourceParameters.OrderBy,
_propertyMappingService.GetPropertyMapping <CategoryUiModel, Category>());
if (!string.IsNullOrEmpty(categoriesResourceParameters.SearchQuery))
{
// trim & ignore casing
var searchQueryForWhereClause = categoriesResourceParameters.SearchQuery
.Trim().ToLowerInvariant();
collectionBeforePaging.QueriedItems = collectionBeforePaging.QueriedItems
.Where(a => a.Name.ToLowerInvariant().Contains(searchQueryForWhereClause));
}
return(Task.Run(() => PagedList <Category> .Create(collectionBeforePaging,
categoriesResourceParameters.PageIndex,
categoriesResourceParameters.PageSize)));
}
public async Task <IActionResult> GetCategoriesAsync([FromQuery] CategoriesResourceParameters categoriesResourceParameters,
[FromHeader(Name = "Accept")] string mediaType)
{
if (!_propertyMappingService.ValidMappingExistsFor <CategoryUiModel, Category>
(categoriesResourceParameters.OrderBy))
{
return(BadRequest());
}
if (!_typeHelperService.TypeHasProperties <CategoryUiModel>
(categoriesResourceParameters.Fields))
{
return(BadRequest());
}
var categoriesQueryable =
await _inquiryAllCategoriesProcessor.GetCategoriesAsync(categoriesResourceParameters);
var categories = Mapper.Map <IEnumerable <CategoryUiModel> >(categoriesQueryable);
if (mediaType.Contains("application/vnd.marvin.hateoas+json"))
{
var paginationMetadata = new
{
totalCount = categoriesQueryable.TotalCount,
pageSize = categoriesQueryable.PageSize,
currentPage = categoriesQueryable.CurrentPage,
totalPages = categoriesQueryable.TotalPages,
};
Response.Headers.Add("X-Pagination", JsonConvert.SerializeObject(paginationMetadata));
var links = CreateLinksForCategories(categoriesResourceParameters,
categoriesQueryable.HasNext, categoriesQueryable.HasPrevious);
var shapedCategories = categories.ShapeData(categoriesResourceParameters.Fields);
var shapedCategoriesWithLinks = shapedCategories.Select(category =>
{
var categoryAsDictionary = category as IDictionary <string, object>;
var categoryLinks =
CreateLinksForCategory((Guid)categoryAsDictionary["Id"], categoriesResourceParameters.Fields);
categoryAsDictionary.Add("links", categoryLinks);
return(categoryAsDictionary);
});
var linkedCollectionResource = new
{
value = shapedCategoriesWithLinks,
links = links
};
return(Ok(linkedCollectionResource));
}
else
{
var previousPageLink = categoriesQueryable.HasPrevious ? CreateCategoriesResourceUri(categoriesResourceParameters,
ResourceUriType.PreviousPage)
: null;
var nextPageLink = categoriesQueryable.HasNext
? CreateCategoriesResourceUri(categoriesResourceParameters, ResourceUriType.NextPage)
: null;
var paginationMetadata = new
{
previousPageLink = previousPageLink,
nextPageLink = nextPageLink,
totalCount = categoriesQueryable.TotalCount,
pageSize = categoriesQueryable.PageSize,
currentPage = categoriesQueryable.CurrentPage,
totalPages = categoriesQueryable.TotalPages
};
Response.Headers.Add("X-Pagination",
JsonConvert.SerializeObject(paginationMetadata));
return(Ok(categories.ShapeData(categoriesResourceParameters.Fields)));
}
}
