public async Task <PagedList <Blogs> > GetBlogsAsync(DtoBlogParameter parameter, bool eager)
{
IQueryable <Blogs> queryExpression;
//是否预加载
if (eager)
{
queryExpression = _context.Set <Blogs>().Include(c => c.Menu).Include(d => d.User);
}
else
{
queryExpression = _context.Set <Blogs>();
}
if (!string.IsNullOrWhiteSpace(parameter.Title))
{
queryExpression = queryExpression.Where(c => c.Title.Contains(parameter.Title));
}
if (!string.IsNullOrWhiteSpace(parameter.Abstract))
{
queryExpression = queryExpression.Where(c => c.Abstract.Contains(parameter.Abstract));
}
if (parameter.UserId != 0)
{
queryExpression = queryExpression.Where(c => c.UserId == parameter.UserId);
}
if (parameter.MenuId != 0)
{
queryExpression = queryExpression.Where(c => c.MenuId == parameter.MenuId);
}
if (parameter.StartTime != null && parameter.EndTime != null)
{
queryExpression = queryExpression.Where(c => c.CreateTime >= parameter.StartTime && c.CreateTime <= parameter.EndTime);
}
var mappingDictionary = _propertyMappingService.GetPropertyMapping <BlogDto, Blogs>();
queryExpression = queryExpression.ApplySort(parameter.OrderBy, mappingDictionary);
return(await PagedList <Blogs> .CreateAsync(queryExpression, parameter.PageNumber, parameter.PageSize));
}
private string CreateBlogsResourceUri(DtoBlogParameter parameters,
ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(Url.Link(nameof(GetBlogs), new
{
fields = parameters.Fields,
pageNumber = parameters.PageNumber - 1,
pageSize = parameters.PageSize,
title = parameters.Title,
summary = parameters.Abstract,
orderBy = parameters.OrderBy
}));
case ResourceUriType.NextPage:
return(Url.Link(nameof(GetBlogs), new
{
fields = parameters.Fields,
pageNumber = parameters.PageNumber + 1,
pageSize = parameters.PageSize,
title = parameters.Title,
summary = parameters.Abstract,
orderBy = parameters.OrderBy
}));
case ResourceUriType.CurrentPage:
default:
return(Url.Link(nameof(GetBlogs), new
{
fields = parameters.Fields,
pageNumber = parameters.PageNumber,
pageSize = parameters.PageSize,
title = parameters.Title,
summary = parameters.Abstract,
orderBy = parameters.OrderBy
}));
}
}
private IEnumerable <LinkDto> CreateLinksForMenus(DtoBlogParameter parameters, bool hasPrevious, bool hasNext)
{
var links = new List <LinkDto>();
links.Add(new LinkDto(CreateBlogsResourceUri(parameters, ResourceUriType.CurrentPage),
"self", "GET"));
if (hasPrevious)
{
links.Add(new LinkDto(CreateBlogsResourceUri(parameters, ResourceUriType.PreviousPage),
"previous_page", "GET"));
}
if (hasNext)
{
links.Add(new LinkDto(CreateBlogsResourceUri(parameters, ResourceUriType.NextPage),
"next_page", "GET"));
}
return(links);
}
public async Task <IActionResult> GetBlogs([FromQuery] DtoBlogParameter parameter, [FromHeader(Name = "Accept")] string mediaType)
{
if (!MediaTypeHeaderValue.TryParse(mediaType, out MediaTypeHeaderValue parsedMediaType))
{
return(BadRequest());
}
if (!_propertyCheckerService.TypeHasProperties <BlogDto>(parameter.Fields))
{
return(BadRequest());
}
if (!_propertyMappingService.ValidMappingExistsFor <BlogDto, Blogs>(parameter.OrderBy))
{
return(BadRequest());
}
var includeLinks = parsedMediaType.SubTypeWithoutSuffix.
EndsWith("hateoas", System.StringComparison.InvariantCultureIgnoreCase);
IEnumerable <LinkDto> myLinks = new List <LinkDto>();
var primaryMediaType = includeLinks
? parsedMediaType.SubTypeWithoutSuffix.Substring(0, parsedMediaType.SubTypeWithoutSuffix.Length - 8)
: parsedMediaType.SubTypeWithoutSuffix;
if (primaryMediaType == "vnd.wuther.blogs.full")
{
var fullBlogs = await _blogsRepository.GetBlogsAsync(parameter, true);
var fullPaginationMetadata = new
{
totalCount = fullBlogs.TotalCount,
pageSize = fullBlogs.PageSize,
currentPage = fullBlogs.CurrentPage,
totalPages = fullBlogs.TotalPages,
};
Response.Headers.Add("X-Pagination", JsonSerializer.Serialize(fullPaginationMetadata, new JsonSerializerOptions
{
Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
}));
var blogFullDtos = _mapper.Map <IList <BlogFullDto> >(fullBlogs);
var shapedFullData = blogFullDtos.shapeData(parameter.Fields);
var fullLinks = CreateLinksForMenus(parameter, fullBlogs.HasPrevious, fullBlogs.HasNext);
var fullLinkedCollectionResource = new
{
value = shapedFullData,
fullLinks
};
return(Ok(fullLinkedCollectionResource));
}
var blogs = await _blogsRepository.GetBlogsAsync(parameter, false);
var paginationMetadata = new
{
totalCount = blogs.TotalCount,
pageSize = blogs.PageSize,
currentPage = blogs.CurrentPage,
totalPages = blogs.TotalPages,
};
Response.Headers.Add("X-Pagination", JsonSerializer.Serialize(paginationMetadata, new JsonSerializerOptions
{
Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
}));
var blogDtos = _mapper.Map <IList <BlogDto> >(blogs);
var shapedData = blogDtos.shapeData(parameter.Fields);
var links = CreateLinksForMenus(parameter, blogs.HasPrevious, blogs.HasNext);
//var shapedMenusWithLinks = shapedData.Select(c =>
//{
// var menuDict = c as IDictionary<string, object>;
// var menusLinks = CreateLinksForMenus((int)menuDict["Id"], null);
// menuDict.Add("links", menusLinks);
// return menuDict;
//});
var linkedCollectionResource = new
{
value = shapedData,
links
};
return(Ok(linkedCollectionResource));
}
