annotate

I'm using annotate to add a property to an object which I can then use for order_by. However, I want to annotate on a field of a relation on a relation. I know I should be able to get to the field somehow using double-underscore notation, but I just can't seem to wrap my head around it. Here are the models: class Group(Taggable, Uploadable): name = models.CharField(max_length=250, db_index=True) description = models.TextField(max_length=5000, null=True, blank=True, db_index=True) private = models.BooleanField(default=False) members = models.ManyToManyField(User, null=True, related_name=

A GIT merge introduces a new commit. This causes problems with "git blame": the merged lines appear to be committed by the developer that did the merge. I can understand this being the case for conflicting changes (because he solved the conflicts). But is there a way to not have this happening for non-conflicting lines? Some option to "git blame"? If there is no way around, this would basically make "git blame" almost useless when you have a lot of merges - and GIT encourages a lot of merges. Does SVN have this issue with non-conflicting merges? I don't think so, but I may be wrong as I

I am looking to add a small white text box, with custom text in the body of my ggplot plot. The text I want to add is to identify a horizontal line I am adding to the plot. ggplot(cb_emp) + geom_point(aes(x = grossunits, y = rate, color = as.factor(outlier)) , alpha = 1/4) + scale_color_discrete(name ="Outcome", breaks=c(0, 1), labels=c("Not outlier", "Outlier")) + geom_hline(aes(yintercept = meancbrate)) + geom_vline(aes(xintercept = meanac) + annotate("text", x = max(grossunits), y = meancbrate, label = "avg rate") Here is the plot I get: Here is the plot I want (or something like this):

废话不说 直接贴源码链接 ： https://git.oschina.net/alexgaoyh/alexgaoyh.git 使用 ehcache 来提高系统的性能，现在用的非常多， 也支持分布式的缓存，在 hibernate 当中作为二级缓存的实现产品，可以提高查询性能。 pom.xml <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-ehcache</artifactId> <version>4.1.6.Final</version> </dependency> 在项目的 src 下面添加 ehcache 的配置文件 ehcache.xml <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd"> <!-- Subdirectories can be specified below the property e.g. java.io.tmpdir/one --> <diskStore path="java.io.tmpdir"/> <!-- Mandatory Default Cache configuration.

Consider this query: query = Novel.objects.< ...some filtering... >.annotate( latest_chapter_id=Max("volume__chapter__id") ) Actually what I need is to annotate each Novel with its latest Chapter object, so after this query I have to execute another query to select actual objects by annotated IDs. IMO this is ugly. Is there a way to combine them into a single query? No, it's not possible to combine them into a single query. You can read the following blog post to find two workarounds. Yes, it's possible. To get a queryset containing all Chapters which are the last in their Novels, simply do:

I searched all over place for an answer to this but couldn't find anything. Perhaps this is just a stupid question or a really tricky one. Here it is: Let's say my model is this (pseudo django code): Event type = ForeignKey(EventType) name = CharField date_start = DateField date_end = DateField EventType name = CharField What I want to know is the average duration time for each event type. What I do now is calculate the average duration whenever a new event is created (save method) and have that stored in an average_duration column in EventType. The problem with this approach is that I cannot