scopes

问题 I am a beginner in Rails and i have a problem with scope. I have my class with 2 scopes : class Event < ActiveRecord::Base belongs_to :continent belongs_to :event_type scope :continent, lambda { |continent| return if continent.blank? composed_scope = self.scoped composed_scope = composed_scope.where('continent_id IN ( ? )', continent).all return composed_scope } scope :event_type, lambda { |eventType| return if eventType.blank? composed_scope = self.scoped composed_scope = composed_scope

问题 I found what I think is peculiar behaviour by python 3.4. I made these small files to illustrate the problem I am facing. To focus on the problem, I now have a python program(module), peculiar.py, containing a class, and some functions. One of the functions are instantiating points from the class Point. When I left click the pygame window, a point is instantiated from the class Point, by this function, add_point. In the command window the instances created this way is listed. Everything is ok

问题 I'm new to the new query interface of ActiveRecord so I'm still figuring things out. I was hoping someone could explain the difference between using a scope in an ActiveRecord model and just using a class method (ie self.some_method ) From what I can gather, a scope is always expected to return a relation, whereas a class method doesn't necessarily have to. Is this true? For instance, I thought it would make sense to do something like: class Person scope :grouped_counts, group(:name).count

问题 I am attempting to open a DM (Direct Message) with an arbitrary user using the im.open Slack API call. I am sending it a user's user_id that I obtain through their clicking of a consent button in order to begin a series of questions. I am sending data to the Slack API successfully along with receiving data. I am getting the following response... { "ok": false, "error": "missing_scope", "needed": "im:write", "provided": "identify,incoming-webhook,chat:write:user,files:write:user", } I have

问题 With Rails 3.1.3 on Ruby 1.9.2 , I have: class User < ActiveRecord::Base has_and_belongs_to_many :states end class State < ActiveRecord::Base has_and_belongs_to_many :users end A User is associated with many State s, and a State with many User s. Given a User , I want to find all other User s who are in any of her states. I tried: class User < ActiveRecord::Base scope :in_state, lambda { |states| joins(:states).where(:states => states) } end User.in_state(current_user.states).all With this

问题 I have a scope that look like this: scope :attr_similar_to, -> (attr, strings) { where("#{attr} similar to ?", "%(#{strings})%") } The way I use this scope is that iterate through a number of attributes and for each attribute I send the attribute into the scope along with a set of multiple strings in the 'strings' variable, which gets sent into this scope as "foo|bar|etc". So for each attribute, I check if the attribute value is similar to any of the strings. The loop where I use this scope

问题 This is a question that spun out of "Rails, how do I chain scopes with an "and" operator between them?". In the accepted answer, the code example generates SQL looking something like: "where 'age' similar to '%(foo|bar)%' AND 'name' similar to '%(foo|bar)%' AND ... and so on. How would I implement this if I want to chain the scopes with OR instead of AND ? 回答1: check the any_of gem. Lets you do things like: banned_users = User.where(banned: true) unconfirmed_users = User.where("confirmed_at

问题 I'm facing a difficulty to understand how scopes work. I found here a small text that describes the scopes of stackexchange api but i need more information on how they work (not specifically this one...). Can someone provide me a concept? Thanks in advance 回答1: To authorize an app you need to call a URL for the OAuth2 authorization process. This URL is "living" in the API's provider documentation. For example Google has this url: https://accounts.google.com/o/auth2/auth Also you will need to

问题 Is it possible to autowire a request scoped bean into an application scoped bean. i.e I have a class RequestScopedBean: class RequestScopedBean { .... .... .... } and a class Application scoped bean in which the request scoped bean is autowired. class ApplicationScopedBean { @Autowire private RequestScopedBean requestScopedBean; .... .... .... } and the spring-config xml is as follows: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi=

问题 I have a (request-scoped) list from which the user may select a "PQ" (list of links). When clicked or otherwise entered into the browser the main page for each PQ shall be displayed. Each PQ's page is of the form http://localhost:8080/projectname/main.jsf?id=2 Here's the PQ bean first: @Named @ViewScoped public class PqHome implements Serializable { @PersistenceContext(unitName="...") private EntityManager em; private Integer id; private PQ instance; @PostConstruct public void init() { System