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  • Method For Making Methods: Easy Ruby Metaprogramming

    - by yar
    I have a bunch of methods like this in view helper def background "#e9eaec" end def footer_link_color "#836448" end I'd like these methods exposed to the view, but I'd prefer the helper to be a bit more concise. What's the best way to turn a hash, say, into methods (or something else)?

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  • Website Listing Commonly Used Ruby Gems, Including Alternatives

    - by ottobar
    I know that I've seen this site before, but cannot remember it for the life of me. Basically, it is a listing of commonly used gems, like XML parsing or ORM libraries. For the ORM case, it lists ActiveRecord, DataMapper, and the like, stating the advantages and disadvantages of each. Does anyone know what this site is? I've googled and have not been able to find it.

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  • fluent interface program in Ruby

    - by intern
    we have made the following code and trying to run it. class Numeric def gram self end alias_method :grams, :gram def of(name) ingredient = Ingredient.new(name) ingredient.quantity=self return ingredient end end class Ingredient def initialize(n) @@name= n end def quantity=(o) @@quantity = o return @@quantity end def name return @@name end def quantity return @@quantity end end e= 42.grams.of("Test") a= Ingredient.new("Testjio") puts e.quantity a.quantity=90 puts a.quantity puts e.quantity the problem which we are facing in it is that the output of puts a.quantity puts e.quantity is same even when the objects are different. what we observed is that second object i.e 'a' is replacing the value of the first object i.e. 'e'. the output is coming out to be 42 90 90 but the output required is 42 90 42 can anyone suggest why is it happening? it is not replacing the object as object id's are different..only the values of the objects are replaced.

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  • fluent interface program in Ruby

    - by intern
    we have made the following code and trying to run it. class Numeric def gram self end alias_method :grams, :gram def of(name) ingredient = Ingredient.new(name) ingredient.quantity=self return ingredient end end class Ingredient def initialize(n) @@name= n end def quantity=(o) @@quantity = o return @@quantity end def name return @@name end def quantity return @@quantity end end e= 42.grams.of("Test") a= Ingredient.new("Testjio") puts e.quantity a.quantity=90 puts a.quantity puts e.quantity the problem which we are facing in it is that the output of puts a.quantity puts e.quantity is same even when the objects are different. what we observed is that second object i.e 'a' is replacing the value of the first object i.e. 'e'. the output is coming out to be 42 90 90 but the output required is 42 90 42 can anyone suggest why is it happening? it is not replacing the object as object id's are different..only the values of the objects are replaced.

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  • Ruby - model.rb:20: syntax error, unexpected keyword_end, expecting $end

    - by Yasir Adnan
    I don't understand what's wrong with my code. model.rb require 'Gemfile' DataMapper.setup(:default, 'mysql://root:password@localhost/rengine') Class User include DataMapper::Resource property :id, Serial # An auto-increment integer key property :email, String, format: :email_address property :username, String, required: true property :password, String , length: 10..255, required: true property :created_at, DateTime property :updated_at, DateTime #User can have mutiple posts has n, :posts end Class Post include DataMapper::Resource property :id, Serial # An auto-increment integer key property :title, String, required: true property :body, Text, required: true property :created_at, DateTime property :updated_at, DateTime #Posts belongs to a USer belongs_to :user end DataMapper.auto_upgrade! I didn't able to figure out. What's problem is here??

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  • Ruby (Shoes) List box crash when populating from excel

    - by DurkD
    I've got a problem when using Shoes. I'm basically trying to open an excel document and pass the names of the worksheets to a list_box. The following method is called on a button press after selecting a file. (This all works and the file opens) exc = WIN32OLE::new('excel.Application') excWB = exc.Workbooks.Open(xlsFile) @excWS = Array::new exc.visible = true excWB.Worksheets.each { |ws| @excWS.push(ws.name) } para @excWS list_box :items=> @excWS Not only do the names not show up in the list_box, the app crashes shortly after loading the box with no error. para @excWS shows the names of the worksheets with no problem. What am I doing wrong?

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  • Creating new table entry when updating another entry of another table - Ruby on Rails

    - by Michaël
    Hi, I have written this code in my "show" view of estimates and I want that, when submitting (update), it creates a new repairs (Repair.new(???)) with some parameters. I don't know where to write the "new repairs" code, in this view or the controller (in update part). I need that the Repair is created one time, not each time the @estimate is updated. <% form_for @estimate, :url => {:controller => "estimates", :action => "update"} do |f| %> <%= f.error_messages %> <select id="estimate_accept" name="estimate[accept]"> <option value="1" selected="selected">accept</option> <option value="2">refuse</option> </select> <%= f.submit "Update" %> <% end %> Thank you for your help, I hope my explanations are clear!

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  • Problem with fetching mail using TMail in Ruby on Rails

    - by Shreyas Satish
    While fetching email, TMail appears to parse the email body twice,when I use this code.All the other parameters are fine(from_email,email_subject). Any ideas? def get_mail Net::POP3.enable_ssl(OpenSSL::SSL::VERIFY_NONE) Net::POP3.start('pop.gmail.com', 995, "uname","pass") do |pop| mail_header=[];mail_subject=[];mail_body=[];mail_from=[] unless pop.mails.empty? pop.each_mail do |mail| email = TMail::Mail.parse(mail.pop) mail_subject = email.subject mail_body = email.body mail_from = email.from email_obj=EmailedQueries.new email_obj.save_email(mail_from, mail_subject, mail_body) end end end end

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  • Catching an error for a child resource in Ruby on Rails

    - by randombits
    What is the best way to add errors to render if a child resource is really what's having issues and not the parent resource? In english what I mean is the following.. imagine the following code: @foo = Foo.new foochild = Foochild.new // break foochild somehow @foo << foochild @foo.save now when I do: format.xml { render :xml => @foo.errors } I don't get anything about how foochild broke, meaning the error message is useless to the user. How does one go about fixing this?

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  • "Personal" method in ruby

    - by steve gooberman-hill
    I'm looking for a way of making a method "personal" - note NOT PRIVATE to a class here is an example - by "personal" I mean the behaviour of method "foo" class A def foo "foo" end end class B < A def foo "bar" end end class C < B end a=A.new; b=B.new;c=C.new I'm looking for a way of producing the following behaviour a.foo #=> "foo" b.foo #=> "bar" c.foo #=> "foo" (ultimate base class method called) Any ideas? Thanks Steve

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  • Error in connection in ruby.

    - by piemesons
    require 'rubygems' require 'mysql' db = Mysql.connect('localhost', 'root', '', 'mohit') //db.rb:4: undefined method `connect' for Mysql:Class (NoMethodError) //undefined method `real_connect' for Mysql:Class (NoMethodError) db.query("CREATE TABLE people ( id integer primary key, name varchar(50), age integer)") db.query("INSERT INTO people (name, age) VALUES('Chris', 25)") begin query = db.query('SELECT * FROM people') puts "There were #{query.num_rows} rows returned" query.each_hash do |h| puts h.inspect end rescue puts db.errno puts db.error end error i am geting is: undefined method `connect' for Mysql:Class (NoMethodError) OR undefined method `real_connect' for Mysql:Class (NoMethodError) EDIT return value of Mysql.methods ["private_class_method", "inspect", "name", "tap", "clone", "public_methods", "object_id", "__send__", "method_defined?", "instance_variable_defined?", "equal?", "freeze", "extend", "send", "const_defined?", "methods", "ancestors", "module_eval", "instance_method", "hash", "autoload?", "dup", "to_enum", "instance_methods", "public_method_defined?", "instance_variables", "class_variable_defined?", "eql?", "constants", "id", "instance_eval", "singleton_methods", "module_exec", "const_missing", "taint", "instance_variable_get", "frozen?", "enum_for", "private_method_defined?", "public_instance_methods", "display", "instance_of?", "superclass", "method", "to_a", "included_modules", "const_get", "instance_exec", "type", "<", "protected_methods", "<=>", "class_eval", "==", "class_variables", ">", "===", "instance_variable_set", "protected_instance_methods", "protected_method_defined?", "respond_to?", "kind_of?", ">=", "public_class_method", "to_s", "<=", "const_set", "allocate", "class", "new", "private_methods", "=~", "tainted?", "__id__", "class_exec", "autoload", "untaint", "nil?", "private_instance_methods", "include?", "is_a?"] return value of Mysql.methods(false) is []... blank array

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  • How to Iterate in ruby ?

    - by Big Bang Theory
    Hi I would like to iterate @some_value outputs the following result {"Meta"=>{"Query"=>"java", "ResultOffset"=>"1", "NumResults"=>"1", "TotalResults"=>"21931"}} i need to retrieve the Value of each individual value for example java 1 1 21931

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  • jquery for ruby on rails

    - by Cezar
    Hello, I am tying to use this code http://gist.github.com/110410 to dump Prototype in favor of jQuery but I do have a problem. This is my HTML (a link_to generated link): <a onclick="var f = document.createElement('form'); f.style.display = 'none'; this.parentNode.appendChild(f); f.method = 'POST'; f.action = this.href;var s = document.createElement('input'); s.setAttribute('type', 'hidden'); s.setAttribute('name', 'authenticity_token'); s.setAttribute('value', 'Mi6RcR6YDyvg2uNwGrpbeIJutSHa2fYboU37wSDE7AU='); f.appendChild(s);f.submit();return false;" class="post add_to_cart " href="/line_items?product_id=547">Add to cart</a> Issue: Everything works as it should except that the page does a reload. I suspect that the submit gets thru which causes a page reload. Is there an elegant way to prevent that ? return false; doesn't seem to cut it in this case.

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  • Ruby not-empty? method

    - by klew
    I want to use expression: !([1,2,3] & [43,5]).empty? => false !([1,2,3] & [3,5]).empty? => true to check if two arrays contains at least one common value. And I wonder if there is a better way of doing it? Maybe something like: ([1,2,3] & [3,5]).non_empty? How to write non_empty? method?

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  • High concurrent request server in ruby

    - by WedTM
    I'm trying to write a simple server that will grab an mp3 file from rackspace cloudfiles, and stream it to a client over HTTP. The server must be able to stream to multiple clients simultaneously, however, I'm finding it difficult to come up with a viable solution. Anyone have some ideas?

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  • Ruby - Manipulating Time/DateTime by the Hour/Day?

    - by viatropos
    Where can I find some examples on how to manipulate the time objects by days/hours/etc? I would like to do this: time.now_by_hour #=> "Tue Jun 15 23 MST 2010" time.now_by_day #=> ""Tue Jun 15 MST 2010" time.now_by_hour - 4.weeks - 3.days #=> "Sat May 15 MST 2010" What is the recommended order of operations? The reason for this is I would like to run through lists of times and sort them by date to the hour, not to the minute and second.

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  • Optimizing this "Boundarize" method for Numerics in Ruby

    - by mstksg
    I'm extending Numerics with a method I call "Boundarize" for lack of better name; I'm sure there are actually real names for this. But its basic purpose is to reset a given point to be within a boundary. That is, "wrapping" a point around the boundary; if the area is betweeon 0 and 100, if the point goes to -1, -1.boundarize(0,100) = 99 (going one too far to the negative "wraps" the point around to one from the max). 102.boundarize(0,100) = 2 It's a very simple function to implement; when the number is below the minimum, simply add (max-min) until it's in the boundary. If the number is above the maximum, simply subtract (max-min) until it's in the boundary. One thing I also need to account for is that, there are cases where I don't want to include the minimum in the range, and cases where I don't want to include the maximum in the range. This is specified as an argument. However, I fear that my current implementation is horribly, terribly, grossly inefficient. And because every time something moves on the screen, it has to re-run this, this is one of the bottlenecks of my application. Anyone have any ideas? module Boundarizer def boundarize min=0,max=1,allow_min=true,allow_max=false raise "Improper boundaries #{min}/#{max}" if min >= max new_num = self if allow_min while new_num < min new_num += (max-min) end else while new_num <= min new_num += (max-min) end end if allow_max while new_num > max new_num -= (max-min) end else while new_num >= max new_num -= (max-min) end end return new_num end end class Numeric include Boundarizer end

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  • Deleting While Iterating in Ruby?

    - by Jesse J
    I'm iterating over a very large set of strings, which iterates over a smaller set of strings. Due to the size, this method takes a while to do, so to speed it up, I'm trying to delete one of the strings from the smaller set that no longer needs to be used. Below is my current code: Ms::Fasta.foreach(@database) do |entry| all.each do |set| if entry.header[1..40].include? set[1] + "|" startVal = entry.sequence.scan_i(set[0])[0] if startVal != nil @locations << [set[0], set[1], startVal, startVal + set[1].length] all.delete(set) end end end end The problem I face is that the easy way, array.delete(string), effectively adds a break statement to the inner loop, which messes up the results. The only way I know how to fix this is to do this: Ms::Fasta.foreach(@database) do |entry| i = 0 while i < all.length set = all[i] if entry.header[1..40].include? set[1] + "|" startVal = entry.sequence.scan_i(set[0])[0] if startVal != nil @locations << [set[0], set[1], startVal, startVal + set[1].length] all.delete_at(i) i -= 1 end end i += 1 end end This feels kind of sloppy to me. Is there a better way to do this? Thanks.

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  • Ruby on Rails when create method fails, render loses local variables

    - by Jimmy
    Hey guys I have a simple create method with some validations and whenever the create method fails due to validation errors it re-renders the 'new' action. The problem is in my new action/view I have a local variable that is established in the action and passed to a partial to render some related information to what the user is creating. Now when my create action fails and I try to re-render the 'new' action I'm getting the always awesome undefined method `cover' for nil:NilClass error. What is the best way to handle re-establishing my action's local variables on a render instead of redirecting to the action again and the user losing the data they input?

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  • Safely escaping and reading back a file path in ruby

    - by user336851
    I need to save a few informations about some files. Nothing too fancy so I thought I would go with a simple one line per item text file. Something like this : # write io.print "%i %s %s\n" % [File.mtime(fname), fname, Digest::SHA1.file(fname).hexdigest] # read io.each do |line| mtime, name, hash = line.scanf "%i %s %s" end Of course this doesn't work because a file name can contain spaces (breaking scanf) and line breaks (breaking IO#each). The line break problem can be avoided by dropping the use of each and going with a bunch of gets(' ') while not io.eof? mtime = Time.at(io.gets(" ").to_i) name = io.gets " " hash = io.gets "\n" end Dealing with spaces in the names is another matter. Now we need to do some escaping. note : I like space as a record delimiter but I'd have no issue changing it for one easier to use. In the case of filenames though, the only one that could help is ascii nul "\0" but a nul delimited file isn't really a text file anymore... I initially had a wall of text detailing the iterations of my struggle to make a correct escaping function and its reciprocal but it was just boring and not really useful. I'll just give you the final result: def write_name(io, val) io << val.gsub(/([\\ ])/, "\\\\\\1") # yes that' 6 backslashes ! end def read_name(io) name, continued = "", true while continued continued = false name += io.gets(' ').gsub(/\\(.)/) do |c| if c=="\\\\" "\\" elsif c=="\\ " continued=true " " else raise "unexpected backslash escape : %p (%s %i)" % [c, io.path, io.pos] end end end return name.chomp(' ') end I'm not happy at all with read_name. Way too long and akward, I feel it shouldn't be that hard. While trying to make this work I tried to come up with other ways : the bittorrent encoded / php serialize way : prefix the file name with the length of the name then just io.read(name_len.to_i). It works but it's a real pita to edit the file by hand. At this point we're halfway to a binary format. String#inspect : This one looks expressly made for that purpose ! Except it seems like the only way to get the value back is through eval. I hate the idea of eval-ing a string I didn't generate from trusted data. So. Opinions ? Isn't there some lib which can do all this ? Am I missing something obvious ? How would you do that ?

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  • Ruby execute code in class getting inherited to

    - by AdamB
    I'm trying to be able to have a global exception capture where I can add extra information when an error happens. I have two classes, "crawler" and "amazon". What I want to do is be able to call "crawl", execute a function in amazon, and use the exception handling in the crawl function. Here are the two classes I have: require 'mechanize' class Crawler Mechanize.html_parser = Nokogiri::HTML def initialize @agent = Mechanize.new end def crawl puts "crawling" begin #execute code in Amazon class here? rescue Exception => e puts "Exception: #{e.message}" puts "On url: #{@current_url}" puts e.backtrace end end def get(url) @current_url = url @agent.get(url) end end class Amazon < Crawler #some code with errors def stuff page = get("http://www.amazon.com") puts page.parser.xpath("//asldkfjasdlkj").first['href'] end end a = Amazon.new a.crawl Is there a way I can call "stuff" inside of "crawl" so I can use that exception handling over the entire stuff function? Is there a better way to accomplish this?

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