counter-cache

问题 My Rails 3 app has 2 models and a third that's join table between them and their has_many relationships. Basically, User and Show are joined by SavedShow, allowing users to save a list of shows: class Show < ActiveRecord::Base has_many :saved_shows has_many :users, :through => :saved_shows end class User < ActiveRecord::Base has_many :saved_shows has_many :shows, :through => :saved_shows end class SavedShow < ActiveRecord::Base belongs_to :user, :counter_cache => :saved_shows_count belongs_to

问题 Although similar questions have already been asked: counter_cache with has_many :through dependent => destroy on a "has_many through" association has_many :through with counter_cache none of them actually addresses my issue. I have three models, with a has_many :through association : class User < ActiveRecord::Base has_many :administrations has_many :calendars, through: :administrations end class Calendar < ActiveRecord::Base has_many :administrations has_many :users, through:

问题 I just implemented a number of custom counter_cache s using code like this: def after_save self.update_counter_cache end def after_destroy self.update_counter_cache end def update_counter_cache self.company.new_matchings_count = Matching.where(:read => false).count self.company.save end My question is this - what does the command Model.save(:validate => false) actually prevent beyond things like validates_with or before_validation ? Will my custom counter_caches be affected if I keep my

问题 I have a rails hotel application which has rooms inside it. Rooms can have n number of tickets associated to them. I have create a counter cache with counter culture gem which updates the room table with number of tickets assigned to it, the problem is i only want count of tickets which are open or in progress state. I have this code it works fine normally but does not work with the condition can anyone guide me by letting me know how can i work it with conditions? Any help is appreciated

问题 I added a counter cache but can't get it to update. But I can update the parent - the Blog Post model by adding a new blog post - and I can update the child - Comments model - by adding a new comment. The counter cache is supposed to keep track of the total number of comments per blog post by auto-updating the blog_posts.comments_count field. I'll outline some of the steps I went through and hopefully someone will notice something I did wrong. The schema dump is at the end. I have a Blog Post

问题 Lets say I have a counter cache that needs to to be incremented on every page load. Say I have 10 web instances. How do I consistently increase a counter cache column? Consistency is easy with one web instance. but with several instances running, A race conditions may occur. Here is a quick explanation. Let's say my counter cache column is called foo_counts and its starting value is 0. If 2 web instance are loaded at the same time, both realize the count as 0. When it comes time to increase

问题 I'm trying to use Mongoid CounterCache but it doesn't work. I tried to just use belongs_to :user, counter_cache: true But it returns Problem: Invalid option :counter_cache provided to relation :user. Summary: Mongoid checks the options that are passed to the relation macros to ensure that no ill side effects occur by letting something slip by. Resolution: Valid options are: autobuild, autosave, dependent, foreign_key, index, polymorphic, touch, class_name, extend, inverse_class_name, inverse

问题 I have a BelongsToMany association, my tables are PostsTable , TagsTable and PostsTagsTable . As explained here in the CakePHP book (associations), I have this fields: tags.id, tags.tag, tags.post_count posts_tags.id, posts_tags.tag_id, posts_tags.post_id Everything works correctly for now. So, as you can understand, now I want to use the tags.post_count field with CounterCache . I followed the CakePHP book, but I suppose this is a special case, in fact it doesn't work by simply adding the

问题 I'm testing with Rspec a model named Solutions which has many Likes. Solution stores how many Likes it have (counter_cache). It has a "likes_count" attribute (and respective db field). When I create a Like record associated to a Solution, I expect that the solution attribute "likes_count" should be updated from nil to 1. When I do that in console, it works. But when I run the spec, doing the SAME THING I do in console, it update TWICE the "likes_count" field, setting it to 2. Take a look (in

问题 I have the table users and scores . Here are the associations: belongs_to :user #score model has_many :scores #user model The table users has the column called scores_count . In this column I store the sum of all values in the table scores . I wanted to use this way for storing the sum of all scores in the column scores_count: :counter_cache => true But :counter_cache => true saving only the count of rows in the table scores . Is there any similar method for storing the sum of all values from