public async Task <bool> isLike(string wechatId, ScoreImageReturn imgR)
{
var q = await(from like in db.Likes
where (like.imageId == imgR.ImageId && like.wechatId == wechatId)
select like).ToListAsync();
return(q.Count > 0);
}
public async Task <IEnumerable <ScoreImageReturn> > GetRandomImages(int K, string visitorWechatId)
{
var query = await(from img in db.Images
orderby Guid.NewGuid()
select img).Take(K).ToListAsync();
List <ScoreImageReturn> returnList = new List <ScoreImageReturn>();
foreach (ScoreImage img in query)
{
ScoreImageReturn imgR = new ScoreImageReturn(img);
imgR.isLike = await isLike(visitorWechatId, imgR);
returnList.Add(imgR);
}
return(returnList);
}
public async Task <IEnumerable <ScoreImageReturn> > GetLabelRankImages(int label, int topK, string visitorWechatId)
{
List <ScoreImageReturn> returnList = new List <ScoreImageReturn>();
if (!Enum.IsDefined(typeof(Label), label))
{
return(returnList);
}
var query = await(from img in db.Images // to do top N
where img.Label == (Label)label
orderby img.Score descending
select img).Take(topK).ToListAsync();
foreach (ScoreImage img in query)
{
ScoreImageReturn imgR = new ScoreImageReturn(img);
imgR.isLike = await isLike(visitorWechatId, imgR);
returnList.Add(imgR);
}
return(returnList);
}
public async Task <IEnumerable <ScoreImageReturn> > GetUserLabelImages(string visitorWechatId, int label)
{
List <ScoreImageReturn> returnList = new List <ScoreImageReturn>();
if (!Enum.IsDefined(typeof(Label), label))
{
return(returnList);
}
var query = await(from img in db.Images
where (img.WechatId == visitorWechatId && img.Label == (Label)label)
orderby img.Score descending
select img).ToListAsync();
foreach (ScoreImage img in query)
{
ScoreImageReturn imgR = new ScoreImageReturn(img);
imgR.isLike = await isLike(visitorWechatId, imgR);
returnList.Add(imgR);
}
return(returnList);
}
public async Task <IEnumerable <ScoreImageReturn> > GetUserImages(string visitorWechatId)
{
List <ScoreImageReturn> returnList = new List <ScoreImageReturn>();
if (visitorWechatId == null)
{
return(returnList);
}
var query = await(from img in db.Images
where img.WechatId == visitorWechatId
orderby img.PostedDate descending
select img).ToListAsync();
foreach (ScoreImage img in query)
{
ScoreImageReturn imgR = new ScoreImageReturn(img);
imgR.isLike = await isLike(visitorWechatId, imgR);
returnList.Add(imgR);
}
return(returnList);
}
