methods

问题 I got undefined local variable or method 'address_geo' for main:Object with the following rake task. What's the problem with it? include Geokit::Geocoders namespace :geocode do desc "Geocode to get latitude, longitude and address" task :all => :environment do @spot = Spot.find(:first) if @spot.latitude.blank? && !@spot.address.blank? puts address_geo end def address_geo arr = [] arr << address if @spot.address arr << city if @spot.city arr << country if @spot.country arr.reject{|y|y==""}.join

问题 I'm have some difficulties here, I am unable to successfully call a method which belongs to a ProjectPage model in the ProjectPage controller . I have in my ProjectPage controller: def index @searches = Project.published.financed @project_pages = form_search(params) end And in my ProjectPage model : def form_search(searches) searches = searches.where('amount > ?', params[:price_min]) if check_params(params[:price_min]) @project_pages = ProjectPage.where(:project_id => searches.pluck(:

问题 I understand that naming conventions are important for a number of reasons, most having to do with making your code more readable and easier to integrate into larger projects, etc. In Java, most conventions require that method names be in lowerCamelCase begin with a verb. My question is: how do I choose the verb to begin the method name? To make this question less vague, I'm often in the situation where my first choice for a method name is a noun describing the output. In these cases, I'm

问题 After checking out the official documentation, I am still not sure on how to create methods for use within mongoose to create & update documents. So how can I do this? I have something like this in mind: mySchema.statics.insertSomething = function insertSomething () { return this.insert(() ? } 回答1: Methods are used to to interact with the current instance of the model. Example: var AnimalSchema = new Schema({ name: String , type: String }); // we want to use this on an instance of Animal

问题 I guess that most factory-like methods start with create . But why are they called "create"? Why not "make", "produce", "build", "generate" or something else? Is it only a matter of taste? A convention? Or is there a special meaning in "create"? createURI(...) makeURI(...) produceURI(...) buildURI(...) generateURI(...) Which one would you choose in general and why? 回答1: Some random thoughts: 'Create' fits the feature better than most other words. The next best word I can think of off the top

问题 I am working on a project that creates a simple perimeter and area calculator based on the values the user inputs. (For finding window perimeter and glass area). However, I'm stuck with 4 errors... all of which are CS0103. Can anyone help me fix these errors or clean up my code. I'm trying to separate everything into methods so I would like to keep the code in that general format. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading

问题 I am working on a project that creates a simple perimeter and area calculator based on the values the user inputs. (For finding window perimeter and glass area). However, I'm stuck with 4 errors... all of which are CS0103. Can anyone help me fix these errors or clean up my code. I'm trying to separate everything into methods so I would like to keep the code in that general format. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading

问题 I have two classes, Field and Background . They look a little bit like this: class Field( object ): def __init__( self, a, b ): self.a = a self.b = b self.field = self.buildField() def buildField( self ): field = [0,0,0] return field class Background( Field ): def __init__( self, a, b, c ): super(Background, self).__init__( a, b ) self.field = self.buildField( c ) def buildField( self, c ): field = [c] return field a, b, c = 0, 1, 2 background = Background( a, b, c ) This error is pointing to

问题 I have two classes, Field and Background . They look a little bit like this: class Field( object ): def __init__( self, a, b ): self.a = a self.b = b self.field = self.buildField() def buildField( self ): field = [0,0,0] return field class Background( Field ): def __init__( self, a, b, c ): super(Background, self).__init__( a, b ) self.field = self.buildField( c ) def buildField( self, c ): field = [c] return field a, b, c = 0, 1, 2 background = Background( a, b, c ) This error is pointing to

问题 How can I make this ActionListener into a method for a specific JButton ? (im aware its possible to throw it all in an method but yeah..hm.) myJButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ //do stuff } }); thx y'all, edit: thanks everyone for the quick responses, my explanation wasn't very clear. I looked into the use of lambdas and it was pretty much what I was thinking of, though the other ways are great to know aswell. myButton