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  • update/validate embedded forms before saving in symfony

    - by Stanislav Palatnik
    I would like to validate an embedded form field before it gets saved in the database. Currently it will save an empty value into the database if the form field is empty. I'm allowing empty fields, but I want nothing inserted if the form field is empty. Also quick question, how to alter field values before validating/saving an embedded form field? $this-form-getObject works in the action, but $this-embeddedForm-getObject says object not found

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  • Create Embedded Resources problem

    - by Night Walker
    I am trying to add an Embedded Resource I am doing it like it is written in following tutorial http://msdn.microsoft.com/en-us/library/e2c9s1d7%28VS.80%29.aspx But I cant the Persistence property from Linked at compile time To Embedded in .resx It always gray at Linked at compile time . Any idea why i have this problem ? Thanks .

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  • Rails requires Rubygems, 1.3.2; I have 1.3.6

    - by JZ
    What is going on here? I'm getting this odd message: Rails requires RubyGems >= 1.3.2. Please install RubyGems and try again: http://rubygems.rubyforge.org justin-zollarss-mac-pro:barcoden2 justinz$ whereis gem /usr/bin/gem justin-zollarss-mac-pro:barcoden2 justinz$ whereis ruby /usr/bin/ruby justin-zollarss-mac-pro:barcoden2 justinz$ whereis rails /usr/bin/rails justin-zollarss-mac-pro:barcoden2 justinz$ ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10] justin-zollarss-mac-pro:barcoden2 justinz$ rails -v Rails 3.0.0.beta justin-zollarss-mac-pro:barcoden2 justinz$ gem -v 1.3.6 justin-zollarss-mac-pro:barcoden2 justinz$ ruby script/server Rails requires RubyGems >= 1.3.2. Please install RubyGems and try again: http://rubygems.rubyforge.org

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  • undefined method get with sinatra

    - by dorelal
    I have following code require 'rubygems' require 'sinatra' get '/' do 'Hello World!' end gem list sinatra *** LOCAL GEMS *** sinatra (1.0, 0.9.4) ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.2.0] Error ruby myapp.rb ["==", "===", "=~", "__id__", "__send__", "class", "clone", "display", "dup", "enum_for", "eql?", "equal?", "extend", "freeze", "frozen?", "hash", "id", "include", "inspect", "instance_eval", "instance_exec", "instance_of?", "instance_variable_defined?", "instance_variable_get", "instance_variable_set", "instance_variables", "is_a?", "kind_of?", "method", "methods", "nil?", "object_id", "private", "private_methods", "protected_methods", "public", "public_methods", "respond_to?", "send", "singleton_methods", "taguri", "taguri=", "taint", "tainted?", "tap", "to_a", "to_enum", "to_s", "to_yaml", "to_yaml_properties", "to_yaml_style", "type", "untaint"] ./sinatra.rb:17: undefined method `get' for main:Object (NoMethodError) from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' from myapp.rb:3

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  • After using modern languages, can C NOT be painful?

    - by Alexandre
    I started my computer engineering course recently and we've been using C for a couple of things. Before starting university, I was doing a lot of web development. I've written a lot of PHP code (yuck!) and for the last year or so Ruby exclusively. aside: I love Ruby, love it! So after a year of heavy Ruby development, is it wrong to think that C should be avoided at all costs unless absolutely necessary? Right now it seems to me I should try to a) get it to run in Ruby b) if it's too slow, try Java c) if it's too slow, use C Is there anyone who jumps straight to C if a VM (Ruby, Java, Python, etc) can be used on the machine and speed is not an issue? In other words, can C NOT be painful?

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  • intalling linecache-0.46 gem(I am using rbenv)

    - by user2899281
    While bundle install the error: Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /home/launchpad/.rbenv/versions/1.9.3-p448/bin/ruby extconf.rb Can't handle 1.9.x yet * extconf.rb failed * Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/launchpad/.rbenv/versions/1.9.3-p448/bin/ruby Gem files will remain installed in /home/launchpad/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/linecache-0.46 for inspection. Results logged to /home/launchpad/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/linecache-0.46/ext/gem_make.out An error occurred while installing linecache (0.46), and Bundler cannot continue. Make sure that gem install linecache -v '0.46' succeeds before bundling.

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  • What's wrong with Bundler working with RubyGems to push a Git repo to Heroku?

    - by stanigator
    I've made sure that all the files are in the root of the repository as recommended in this discussion. However, as I follow the instructions in this section of the book, I can't get through the section without the problems. What do you think is happening with my system that's causing the error? I have no clue at the moment of what the problem means despite reading the following in the log. Thanks in advance for your help! stanley@ubuntu:~/rails_sample/first_app$ git push heroku master Warning: Permanently added the RSA host key for IP address '50.19.85.156' to the list of known hosts. Counting objects: 96, done. Compressing objects: 100% (79/79), done. Writing objects: 100% (96/96), 28.81 KiB, done. Total 96 (delta 22), reused 0 (delta 0) -----> Heroku receiving push -----> Ruby/Rails app detected -----> Installing dependencies using Bundler version 1.2.0.pre Running: bundle install --without development:test --path vendor/bundle --binstubs bin/ --deployment Fetching gem metadata from https://rubygems.org/....... Installing rake (0.9.2.2) Installing i18n (0.6.0) Installing multi_json (1.3.5) Installing activesupport (3.2.3) Installing builder (3.0.0) Installing activemodel (3.2.3) Installing erubis (2.7.0) Installing journey (1.0.3) Installing rack (1.4.1) Installing rack-cache (1.2) Installing rack-test (0.6.1) Installing hike (1.2.1) Installing tilt (1.3.3) Installing sprockets (2.1.3) Installing actionpack (3.2.3) Installing mime-types (1.18) Installing polyglot (0.3.3) Installing treetop (1.4.10) Installing mail (2.4.4) Installing actionmailer (3.2.3) Installing arel (3.0.2) Installing tzinfo (0.3.33) Installing activerecord (3.2.3) Installing activeresource (3.2.3) Installing coffee-script-source (1.3.3) Installing execjs (1.3.2) Installing coffee-script (2.2.0) Installing rack-ssl (1.3.2) Installing json (1.7.3) with native extensions Installing rdoc (3.12) Installing thor (0.14.6) Installing railties (3.2.3) Installing coffee-rails (3.2.2) Installing jquery-rails (2.0.2) Using bundler (1.2.0.pre) Installing rails (3.2.3) Installing sass (3.1.18) Installing sass-rails (3.2.5) Installing sqlite3 (1.3.6) with native extensions Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb checking for sqlite3.h... no sqlite3.h is missing. Try 'port install sqlite3 +universal' or 'yum install sqlite-devel' and check your shared library search path (the location where your sqlite3 shared library is located). *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/local/bin/ruby --with-sqlite3-dir --without-sqlite3-dir --with-sqlite3-include --without-sqlite3-include=${sqlite3-dir}/include --with-sqlite3-lib --without-sqlite3-lib=${sqlite3-dir}/lib --enable-local --disable-local Gem files will remain installed in /tmp/build_3tplrxvj7qa81/vendor/bundle/ruby/1.9.1/gems/sqlite3-1.3.6 for inspection. Results logged to /tmp/build_3tplrxvj7qa81/vendor/bundle/ruby/1.9.1/gems/sqlite3-1.3.6/ext/sqlite3/gem_make.out An error occurred while installing sqlite3 (1.3.6), and Bundler cannot continue. Make sure that `gem install sqlite3 -v '1.3.6'` succeeds before bundling. ! ! Failed to install gems via Bundler. ! ! Heroku push rejected, failed to compile Ruby/rails app To [email protected]:growing-mountain-2788.git ! [remote rejected] master -> master (pre-receive hook declined) error: failed to push some refs to '[email protected]:growing-mountain-2788.git' ------Gemfile------------------------ As requested, here's the auto-generated gemfile: source 'https://rubygems.org' gem 'rails', '3.2.3' # Bundle edge Rails instead: # gem 'rails', :git => 'git://github.com/rails/rails.git' gem 'sqlite3' gem 'json' # Gems used only for assets and not required # in production environments by default. group :assets do gem 'sass-rails', '~> 3.2.3' gem 'coffee-rails', '~> 3.2.1' # See https://github.com/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', :platform => :ruby gem 'uglifier', '>= 1.0.3' end gem 'jquery-rails' # To use ActiveModel has_secure_password # gem 'bcrypt-ruby', '~> 3.0.0' # To use Jbuilder templates for JSON # gem 'jbuilder' # Use unicorn as the app server # gem 'unicorn' # Deploy with Capistrano # gem 'capistrano' # To use debugger # gem 'ruby-debug'

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  • Gem::Install Error

    - by Tian
    When I try to cleanup my rails versions with sudo gem cleanup rails I get the following error: Cleaning up installed gems... Attempting to uninstall rails-2.3.5 Unable to uninstall rails-2.3.5: Gem::InstallError: cannot uninstall, check `gem list -d rails` Attempting to uninstall rails-1.2.6 Unable to uninstall rails-1.2.6: Gem::InstallError: cannot uninstall, check `gem list -d rails` gem list -d rails results in: rails (2.3.8, 2.3.5, 1.2.6) Author: David Heinemeier Hansson Rubyforge: http://rubyforge.org/projects/rails Homepage: http://www.rubyonrails.org Installed at (2.3.8): /Library/Ruby/Gems/1.8 (2.3.5): /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8 (1.2.6): /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8 Web-application framework with template engine, control-flow layer, and ORM. Any one know what's wrong?

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  • Cannot send e-mail with rails 2.3.4(I could with 2.3.2)

    - by Brian Roisentul
    I'm working with ruby on rails 2.3.4 and I yesterday I found out I cannot send emails any more. The email-related credentials are ok because I could send emails until I upgraded my rails version about two weeks ago. The error message I get is the following: ArgumentError in UsersController#create wrong # of arguments(3 for 2) D:/Proyectos/Cursometro/www/vendor/plugins/action_mailer_tls/lib/smtp_tls.rb:8:in `check_auth_args' D:/Proyectos/Cursometro/www/vendor/plugins/action_mailer_tls/lib/smtp_tls.rb:8:in `do_start' C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/1.8/net/smtp.rb:525:in `start' C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/actionmailer-2.3.4/lib/action_mailer/base.rb:682:in `perform_delivery_smtp' C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/actionmailer-2.3.4/lib/action_mailer/base.rb:523:in `deliver!' C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/actionmailer-2.3.4/lib/action_mailer/base.rb:395:in `method_missing' D:/Proyectos/Cursometro/www/app/models/user_observer.rb:3:in `after_create' D:/Proyectos/Cursometro/www/app/controllers/users_controller.rb:221:in `create_new_user' D:/Proyectos/Cursometro/www/app/controllers/users_controller.rb:101:in `create' Please, help!

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  • Why does bash sometimes think my $HOME isn't the correct directory?

    - by Adam Yanalunas
    Like the title says it seems that bash sometimes misidentifies my $HOME. This cropped up after a seemingly unique series of events that I will now replay in broad strokes. Running OS X 10.6 with normal, local account Work binds my account to Active Directory Much time passes with no issues Set up rvm to manage Ruby installs (this becomes important later) Upgraded to OS X 10.7 a few days ago After successful install, attempted to log in, was presented with "Must reset password" dialog that never allowed a password to be reset. Would simply shake the box after new password was entered. Much googling was done. Much more googling was done. Swearing was had. Logged in as root, created new account, set as admin, deleted /Users/[new account], renamed /Users/[old account] to /Users/[new account] Logged out of root, logged into new account with no issues After OS X asking for a my account password a few times to update Keychain and other system-level stuff it was back to business as usual. Opened Terminal, cd to project folder, tried "rails server" and was presented with: /usr/local/lib/ruby/1.9.1/rubygems/dependency.rb:247:in to_specs': Could not find rails (>= 0) amongst [] (Gem::LoadError) from /usr/local/lib/ruby/1.9.1/rubygems/dependency.rb:256:into_spec' from /usr/local/lib/ruby/1.9.1/rubygems.rb:1210:in gem' from /usr/local/bin/rails:18:in' Ran through a few exercises, decided to rm -rf ~/.rvm and reinstall. Running a --trace on the rvm installer shows it dies on this line: mkdir: /Users/[old account]: Permission denied Scrolling back through the --trace log I see many more mentions of /Users/[old account]. When inspect the install script the offending line is looking at "${HOME}/.rvm" as it tries to run the mkdir. To my confusion I also see mentions of /Users/[new account] in the log. I've tried exporting a new HOME in my .bash_profile to no luck. Can anyone guess why /Users/[old account] would still be kicking around?

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  • Passenger not booting Rails App

    - by firecall
    I'm at the end of ability, so time to ask for help. My hosting company are moving me to a new server. I've got my own VPS. It's a fresh CentOS 5 install with Plesk 9.5.2 Essentially Passenger just doesnt seem to be booting the Rails app. It's like it doesnt see it's a Rails app to be booted. I've got Rails 3.0 install with Ruby 1.9.2 built from source. I can run Bundle Install and that works. I've currently got Passenger 3 RC1 installed as per here, but have tried v2 as well. My conf/vhost.conf file looks like this: DocumentRoot /var/www/vhosts/foosite.com.au/httpdocs/public/ RackEnv development #Options Indexes I've got a /etc/httpd/conf.d/passenger.conf file which looks like this: LoadModule passenger_module /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.0.pre4/ext/apache2/mod_passenger.so PassengerRoot /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.0.pre4 PassengerRuby /usr/local/bin/ruby PassengerLogLevel 2 and all I get is a 403 forbidden or the directory listing if I enable Indexes. I dont know what else to do! Yikes. There's nothing in the Apache error log that I can see. The new server admin isnt much help as I think he's a bit junior and says he doesnt know about Rails... sigh :/ I'm a programmer and server admin isnt my bag :(

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  • Passenger not booting Rails App

    - by firecall
    I'm at the end of ability, so time to ask for help. My hosting company are moving me to a new server. I've got my own VPS. It's a fresh CentOS 5 install with Plesk 9.5.2 Essentially Passenger just doesnt seem to be booting the Rails app. It's like it doesnt see it's a Rails app to be booted. I've got Rails 3.0 install with Ruby 1.9.2 built from source. I can run Bundle Install and that works. I've currently got Passenger 3 RC1 installed as per here, but have tried v2 as well. My conf/vhost.conf file looks like this: DocumentRoot /var/www/vhosts/foosite.com.au/httpdocs/public/ RackEnv development #Options Indexes I've got a /etc/httpd/conf.d/passenger.conf file which looks like this: LoadModule passenger_module /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.0.pre4/ext/apache2/mod_passenger.so PassengerRoot /usr/local/lib/ruby/gems/1.9.1/gems/passenger-3.0.0.pre4 PassengerRuby /usr/local/bin/ruby PassengerLogLevel 2 and all I get is a 403 forbidden or the directory listing if I enable Indexes. I dont know what else to do! Yikes. There's nothing in the Apache error log that I can see. The new server admin isnt much help as I think he's a bit junior and says he doesnt know about Rails... sigh :/ I'm a programmer and server admin isnt my bag :(

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  • Changing PATH Environment Variable for all Users. (Ubuntu)

    - by Wally Glutton
    I recently compiled Ruby Enterprise Edition (REE) on an Ubuntu 8.04 server. I would like to update my PATH to ensure this new version of Ruby (found in /opt/ruby_ee/bin) supersedes the older version in /usr/local/bin. (I still want the old version around, though.) I would like these PATH changes to affect all users and crontabs. Attempted Solution #1: The REE documentation recommends placing the REE bin folder at the beginning of the global PATH in /etc/environment. I altered the PATH in this file to read: PATH="/opt/ruby_ee/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" This did not affect my PATH at all. Attempted Solution #2: Next I followed these instructions and updated the PATH setting in /etc/login.defs and /etc/crontab. (I did not change /etc/sudoers.) This didn't affect my PATH either, even after logging out and rebooting the server. Other information: I seem to be having the same problem described here. I'm testing using the commands "echo $PATH" and "ruby -v". My shell is bash. My .bashrc doesn't override my PATH. Yes, I have heard of the Ruby Version Manager project. ;)

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  • OTN Article: The Enterprise Side of JavaFX (part 1 of 2)

    - by terrencebarr
    OTN just published part 1 of a series by Adam Bien on “The Enterprise Side of JavaFX”. In this article, learn how to use LightView to convert REST services into a bindable set of properties, using JavaFX, Glassfish, LightFish, and Maven. Sample code included. Part 2 will discuss the integration of a JavaServer Faces 2 UI with WebView. Cheers, – Terrence Filed under: Mobile & Embedded Tagged: glassfish, JavaFX

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  • How do I find out which boot loader I have?

    - by binW
    I know Grub is the one installed by default when installing Ubuntu but I am faced with an embedded system running 9.10 Desktop Edition. Following are the contents of lsb-release file ubuntu@ubuntu-desktop:/boot$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" but this system does not have Grub bootloader and I want to find out which one its using. So any ideas?

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  • How to unit test with lots of IO

    - by Eric
    I write Linux embedded software which closely integrates with hardware. My modules are such as : -CMOS video input with kernel driver (v4l2) -Hardware h264/mpeg4 encoders (texas instuments) -Audio Capture/Playback (alsa) -Network IO I'd like to have automated testing for those functionalities, such as integration testing. I am not sure how I can automate this process since most of the top level functionalities I face are IO bound. Sure, it is easy to test functions individually, but whole process checking means depending on tons of external dependencies only available at runtime.

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  • How do I find out which boot loader I have?

    - by binW
    I know Grub is the one installed by default when installing Ubuntu but I am faced with an embedded system running 9.10 Desktop Edition. Following are the contents of lsb-release file ubuntu@ubuntu-desktop:/boot$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" but this system does not have Grub bootloader and I want to find out which one its using. So any ideas?

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  • Has test driven development (TDD) actually benefited a real world project?

    - by James
    I am not new to coding. I have been coding (seriously) for over 15 years now. I have always had some testing for my code. However, over the last few months I have been learning test driven design/development (TDD) using Ruby on Rails. So far, I'm not seeing the benefit. I see some benefit to writing tests for some things, but very few. And while I like the idea of writing the test first, I find I spend substantially more time trying to debug my tests to get them to say what I really mean than I do debugging actual code. This is probably because the test code is often substantially more complicated than the code it tests. I hope this is just inexperience with the available tools (RSpec in this case). I must say though, at this point, the level of frustration mixed with the disappointing lack of performance is beyond unacceptable. So far, the only value I'm seeing from TDD is a growing library of RSpec files that serve as templates for other projects/files. Which is not much more useful, maybe less useful, than the actual project code files. In reading the available literature, I notice that TDD seems to be a massive time sink up front, but pays off in the end. I'm just wondering, are there any real world examples? Does this massive frustration ever pay off in the real world? I really hope I did not miss this question somewhere else on here. I searched, but all the questions/answers are several years old at this point. It was a rare occasion when I found a developer who would say anything bad about TDD, which is why I have spent as much time on this as I have. However, I noticed that nobody seems to point to specific real-world examples. I did read one answer that said the guy debugging the code in 2011 would thank you for have a complete unit testing suite (I think that comment was made in 2008). So, I'm just wondering, after all these years, do we finally have any examples showing the payoff is real? Has anybody actually inherited or gone back to code that was designed/developed with TDD and has a complete set of unit tests and actually felt a payoff? Or did you find that you were spending so much time trying to figure out what the test was testing (and why it was important) that you just tossed out the whole mess and dug into the code?

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  • Getting my younger brother started on programming

    - by SmartLemon
    My younger brother is 13 years old, I started programming when I started to develop Android applications when I was 15, last year my brother gained an interest in it and he would always pestering me about letting him make something himself, so I wrote him a few tutorials and he built himself a small application that had a few buttons that did something, I think you put in your dob and it would tell you what day you were born on, he took a couple of days building up to his final application, maybe even a week, learning everything he needed. Since then he hasn't really done much more because I have been engulfed in work and such where I have my own programming problems to sort out. I told him that when he was my age (I am 17) that he should be better then me, he was a bit sceptical about this however. I dont think he has as much logical reasoning as I would think he needs to solve more complex problems, but shouldnt that just develop over time as it did with me? He has been pestering me for the past week or something to write him more tutorials, but I didn't have time. All I had with me was a playlist I had downloaded from the new boston from youtube for C++, it's about 73 videos. He is currently about 20-30 videos in, he has come to ask me a few questions about it and thats it. Should I have really properly started him with C++? Should I stop him now and start him again on python or ruby? I know that C++ shouldn't really be a beginners language, especially for someone who is only 13, by the time this question is answered will probably be up to learning about inheritance or something. Some people may see this as not a real question, but it is, and should be used as a reference for others. I want to know, should I start him on a different language whch is more easy? What language then? And would it be better for me to teach him myself (I would make time) or just continue him with the new boston? There are a few more questions throughout this question but these are the main ones. Part of the question people seem to be neglecting is me asking whether I should change what language he is learning to another, or since he is already pretty far through the tutorials should I just leave him with C++ and he can learn the other languages freely by himself?

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  • Is the Observer pattern adequate for this kind of scenario?

    - by Omega
    I'm creating a simple game development framework with Ruby. There is a node system. A node is a game entity, and it has position. It can have children nodes (and one parent node). Children are always drawn relatively to their parent. Nodes have a @position field. Anyone can modify it. When such position is modified, the node must update its children accordingly to properly draw them relatively to it. @position contains a Point instance (a class with x and y properties, plus some other useful methods). I need to know when a node's @position's state changes, so I can tell the node to update its children. This is easy if the programmer does something like this: @node.position = Point.new(300,300) Because it is equivalent to calling this: # Code in the Node class def position=(newValue) @position = newValue update_my_children # <--- I know that the position changed end But, I'm lost when this happens: @node.position.x = 300 The only one that knows that the position changed is the Point instance stored in the @position property of the node. But I need the node to be notified! It was at this point that I considered the Observer pattern. Basically, Point is now observable. When a node's position property is given a new Point instance (through the assignment operator), it will stop observing the previous Point it had (if any), and start observing the new one. When a Point instance gets a state change, all observers (the node owning it) will be notified, so now my node can update its children when the position changes. A problem is when this happens: @someNode.position = @anotherNode.position This means that two nodes are observing the same point. If I change one of the node's position, the other would change as well. To fix this, when a position is assigned, I plan to create a new Point instance, copy the passed argument's x and y, and store my newly created point instead of storing the passed one. Another problem I fear is this: somePoint = @node.position somePoint.x = 500 This would, technically, modify @node's position. I'm not sure if anyone would be expecting that behavior. I'm under the impression that people see Point as some kind of primitive rather than an actual object. Is this approach even reasonable? Reasons I'm feeling skeptical: I've heard that the Observer pattern should be used with, well, many observers. Technically, in this scenario there is only one observer at a time. When assigning a node's position as another's (@someNode.position = @anotherNode.position), where I create a whole new instance rather than storing the passed point, it feels hackish, or even inefficient.

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  • Embedded Net DVR camera1 failed to start preview!

    - by user44212
    I am gettig the following error as "Embedded Net DVR camera1 failed to start preview!" when we are trying to login and view the preview of the cameras on the DVR 8116HCI-S Standalone. There is an IP Address assigned to the same via which we access the same. I checked the site for information here http://www.hikvision.com/en/Products_show.asp?id=32. But could not find any useful information relating to the error message. We can access the same via login in from one machine but we are not able to access it from more than one machine.

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  • What does Embedded SATA Controller : ATA mean?

    - by paulH
    I have a Poweredge R510 server with a PERC H700 Integrated RAID controller that is exhibiting slower than expected disk speeds (RAID 1 and RAID 10 arrays) and I'm looking at the configuration of the server. Running the command omreport chassis biossetup on the server shows me the following configuration setting: Embedded SATA Controller : ATA I can also see that the possible options for this setting are: off | ata | qdma | raid I've been looking online to find out what this setting means and what the various options refer to but I've been unable to find anything particularly helpful, so I was hoping that somebody here could help to enlighten me. Thanks, Paul.

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  • Configure Windows XP Embedded to automatically dismiss unexpected MessageBoxes

    - by Pokot0
    I have the need to configure a Windows XP Embedded system in order to dismiss modal MessageBoxes with a default reply. I am aware of the EnableDefaultReply feature but I need to be more selective on which MessageBoxes to dismiss or select the default reply on some criteria (example: name of the window). My biggest problem right now is that: If do not enable the EnableDefaultReply feature: some background services pop up dialogboxes which are never dismissed and block the application If I enable the EnableDefaultReply feature: I am no longer able to logon to the system if another user is logged in (a MessageBox popups asking if you want to steal the logon and the default answer is NO). Do you have any experience you can share with this problem?

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  • Changing bounds of excel file embedded in powerpoint

    - by Brett
    When I embed an excel files into powerpoint, I'm having two issues. On some of the spreadsheets, empty columns are displayed on the right hand side of the powerpoint slide On other spreadsheets that are too large to fit, I can't adjust the bounds of what I'd like to be displayed on the slide. So, I couldn't choose a larger area to display of the excel spreadsheet and just size it down. It arbitrarily chooses where to cut off the excel spreadsheet on the slide. Is there any way to adjust which part of the excel file is embedded?

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