我遇到这个奇怪的问题，我在客户端（JS）设置了一个限制（和偏移），通过ajax将它发送到Rails控制器，即使params说限制是我期望的（14） ），吐出双倍（28）。有一个'查看更多'按钮，它比另一组轨道分页并上升偏移，再次应该是14，表示它的14，但是吐了一个额外的28.我记录一些put语句，输出就是我的expect（限制14，每次分页时偏移量增加14）。关于为什么我得到双倍限制的任何想法我指定的？这是一些codez：
以下是相关的JS函数：
function queue(params, method) {
var req;
params = params || {};
params = _.extend(params, {
limit: 14,
order: _order
});
method = method || 'html';
req = {
params: params,
method: method
};
fetch(req);
}
/**
* Hits our filter_tracks controller action
* @private
*/
function fetch(req){
self.spin(true);
if (mm.isMobile) {
mm.spin(true);
}
if(_fetchingAjax) _fetchingAjax.abort();
_fetchingAjax = $.ajax({
url: '/filter_tracks',
data: req.params,
success: function (data) {
$resultsTarg[req.method](data);
buildTracks();
mm.facade.trigger('bypass');
self.spin(false);
if (mm.isMobile) {
mm.spin(false);
}
if (mm.isMobile && !req.params.offset) {
self.view(false);
}
if (!req.params.offset) _.defer(count);
}
}).always(function(){
_fetchingAjax = null;
});
}
/**
* Tracks must be built (instantiated) every time the partial is rerendered or
* becomes extended with the 'view more' button
* @private
*/
function buildTracks() {
var tracks = $('.track-item', $resultsTarg);
// if tracks already exist, remove them [MAKE ME BETTER]
if (_tracks.length) {
_tracks.forEach(function (track) {
track.destroy();
});
_tracks = [];
}
// recreate tracks
tracks.each(function (i, track) {
_tracks.push(mm.Track($(track)));
});
}
它出现在我的轨道控制器中：
def filter_tracks
params[:limit] ||= 50
params[:offset] ||= 0
params[:order] ||= 'rank DESC'
puts "/" * 150
puts params[:limit]
puts params[:offset]
puts "/" * 150
# heavy rotation filter flag
heavy_rotation ||= (params[:order] == 'rank DESC')
@result_offset = params[:offset]
@tracks = Track.ready.with_artist
params[:order] = "tracks.#{params[:order]}"
if params[:order]
order = params[:order]
order.match(/artist.*/){|m|
params[:order] = params[:order].sub /tracks\./, ''
}
order.match(/title.*/){|m|
params[:order] = params[:order].sub /tracks.(title)(.*)/i, 'LOWER(\1)\2'
}
end
@tracks = parse_params(params[:q], @tracks)
@tracks = @tracks.offset(params[:offset])
@result_count = @tracks.count
@tracks = @tracks.order(params[:order], 'tracks.updated_at DESC').limit(params[:limit])
# restructure heavy rotation results
if heavy_rotation
puts "*" * 150
puts params[:limit]
puts params[:offset]
puts "*" * 150
three_weeks_ago = Time.now - 21.days
# sub-query top results
tracks_top_results = @tracks.where(
"tracks.updated_at >= :top",
top: three_weeks_ago
)
# sub-query remaining
tracks_remaining_results = @tracks.where(
"tracks.updated_at < :remaining",
remaining: three_weeks_ago
)
@tracks = tracks_top_results + tracks_remaining_results
@tracks.shuffle!
end
render partial: "shared/results"
end
编辑：
这是日志：
2015-03-16T17:06:27.637654+00:00 app[web.2]: Started GET "/browse?_ajax=1" for 198.0.42.137 at 2015-03-16 17:06:27 +0000
2015-03-16T17:06:27.748603+00:00 app[web.2]: Rendered shared/_results.html.erb (0.9ms)
2015-03-16T17:06:27.659777+00:00 app[web.2]: Processing by TracksController#index as */*
2015-03-16T17:06:27.659818+00:00 app[web.2]: Parameters: {"_ajax"=>"1"}
2015-03-16T17:06:27.745758+00:00 app[web.2]: Rendered shared/_sorter.html.erb (0.7ms)
2015-03-16T17:06:27.753180+00:00 app[web.2]: Rendered shared/_table.html.erb (6.5ms)
2015-03-16T17:06:27.753270+00:00 app[web.2]: Rendered tracks/index.html.erb (40.1ms)
2015-03-16T17:06:27.753674+00:00 app[web.2]: Completed 200 OK in 94ms (Views: 78.4ms | ActiveRecord: 3.8ms)
2015-03-16T17:06:27.769464+00:00 heroku[router]: at=info method=GET path="/browse?_ajax=1" host=staging-marmosetmusic.herokuapp.com request_id=846db817-4654-43ab-8f99-7994b8a18950 fwd="198.0.42.137" dyno=web.2 connect=1ms service=136ms status=304 bytes=378
2015-03-16T17:06:27.960153+00:00 app[web.2]: Started GET "/moods.json?bucket=story" for 198.0.42.137 at 2015-03-16 17:06:27 +0000
2015-03-16T17:06:28.188416+00:00 app[web.2]: Started GET "/filter_tracks?limit=14&order=rank+DESC" for 198.0.42.137 at 2015-03-16 17:06:28 +0000
2015-03-16T17:06:28.210975+00:00 app[web.2]: Processing by TracksController#filter_tracks as */*
2015-03-16T17:06:28.211023+00:00 app[web.2]: Parameters: {"limit"=>"14", "order"=>"rank DESC"}
2015-03-16T17:06:28.222862+00:00 app[web.2]: //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
2015-03-16T17:06:28.222866+00:00 app[web.2]: 14
2015-03-16T17:06:28.222868+00:00 app[web.2]: 0
2015-03-16T17:06:28.222870+00:00 app[web.2]: //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
2015-03-16T17:06:28.318029+00:00 app[web.2]: ******************************************************************************************************************************************************
2015-03-16T17:06:28.318037+00:00 app[web.2]: 14
2015-03-16T17:06:28.318039+00:00 app[web.2]: 0
2015-03-16T17:06:28.318041+00:00 app[web.2]: ******************************************************************************************************************************************************
2015-03-16T17:06:28.348873+00:00 app[web.2]: Processing by TracksController#moods as JSON
2015-03-16T17:06:28.348884+00:00 app[web.2]: Parameters: {"bucket"=>"story"}
2015-03-16T17:06:28.478141+00:00 heroku[router]: at=info method=GET path="/moods.json?bucket=story" host=staging-marmosetmusic.herokuapp.com request_id=b68356eb-7b2f-4341-ba30-29d6d3e4ff5d fwd="198.0.42.137" dyno=web.2 connect=1ms service=527ms status=304 bytes=378
2015-03-16T17:06:28.463840+00:00 app[web.2]: Completed 200 OK in 115ms (ActiveRecord: 8.0ms)
2015-03-16T17:06:28.710111+00:00 app[web.2]: Rendered shared/_track_item.html.erb (115.9ms)
2015-03-16T17:06:28.463520+00:00 app[web.2]: Read fragment views/staging-marmosetmusic.herokuapp.com/moods.json (1.4ms)
2015-03-16T17:06:28.593527+00:00 app[web.2]: Rendered shared/_track_item.html.erb (10.0ms)
2015-03-16T17:06:28.714491+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.7ms)
2015-03-16T17:06:28.720260+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.7ms)
2015-03-16T17:06:28.725627+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.5ms)
2015-03-16T17:06:28.717344+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.6ms)
2015-03-16T17:06:28.722971+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.5ms)
2015-03-16T17:06:28.728223+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.4ms)
2015-03-16T17:06:28.734289+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.1ms)
2015-03-16T17:06:28.741642+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.3ms)
2015-03-16T17:06:28.748142+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.9ms)
2015-03-16T17:06:28.758640+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.9ms)
2015-03-16T17:06:28.758645+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.2ms)
2015-03-16T17:06:28.730928+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.5ms)
2015-03-16T17:06:28.737758+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.1ms)
2015-03-16T17:06:28.744971+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.0ms)
2015-03-16T17:06:28.752438+00:00 app[web.2]: Rendered shared/_track_item.html.erb (4.0ms)
2015-03-16T17:06:28.765492+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.9ms)
2015-03-16T17:06:28.773917+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.0ms)
2015-03-16T17:06:28.780813+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.4ms)
2015-03-16T17:06:28.788779+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.1ms)
2015-03-16T17:06:28.796253+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.1ms)
2015-03-16T17:06:28.762271+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.7ms)
2015-03-16T17:06:28.770673+00:00 app[web.2]: Rendered shared/_track_item.html.erb (4.9ms)
2015-03-16T17:06:28.778036+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.8ms)
2015-03-16T17:06:28.785552+00:00 app[web.2]: Rendered shared/_track_item.html.erb (4.0ms)
2015-03-16T17:06:28.792803+00:00 app[web.2]: Rendered shared/_track_item.html.erb (3.7ms)
2015-03-16T17:06:28.799688+00:00 app[web.2]: Rendered shared/_track_item.html.erb (2.9ms)
2015-03-16T17:06:28.799694+00:00 app[web.2]: Rendered shared/_results.html.erb (219.2ms)
2015-03-16T17:06:28.799893+00:00 app[web.2]: Completed 200 OK in 589ms (Views: 222.2ms | ActiveRecord: 170.6ms)
2015-03-16T17:06:28.834891+00:00 heroku[router]: at=info method=GET path="/filter_tracks?limit=14&order=rank+DESC" host=staging-marmosetmusic.herokuapp.com request_id=ebb74235-f5a5-4501-ab52-7857ef93db5d fwd="198.0.42.137" dyno=web.2 connect=1ms service=649ms status=200 bytes=5515