Recent questions tagged Ruby

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ruby - How to write to a JSON file in the correct format

I am creating a hash in Ruby and want to write it to a JSON file, in the correct format. Here is my ... the file in the correct JSON format? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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354 views

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ruby on rails - What is the meaning of erb?

Why is the view of Rails application in the format *.erb.html? What does "erb" mean? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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753 views

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ruby on rails - Error message: Make sure that `gem install pg -v '0.18.1'` succeeds before bundling

i have a problem with ruby. I tried a lot but nothing works for me. When i want to start the rails server ... :development do gem 'sqlite3' end See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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375 views

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ruby on rails - Are redirect_to and render exchangeable?

For the code below, what happens if replacing redirect_to with render or vise verse? def create @product = ... lost after redirecting. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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445 views

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ruby - What does the equal ('=') symbol do when put after the method name in a method definition?

I saw this in a screencast and was just wondering what the '=' symbol does in this case. def express_token=( ... '=' is outside the brackets. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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507 views

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ruby - How to preserve request url with nginx proxy_pass

I was trying to use Thin app server and had one issue. When nginx proxies the request to Thin (or Unicorn ... request URL from the client? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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ruby on rails - Heroku SSL on root domain

I am trying to setup SSL for my heroku app. I am using the hostname based SSL add-on. The heroku documentation ... $100 per month IP based SSL) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

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ruby on rails - Converting an array of objects to ActiveRecord::Relation

I have an array of objects, let's call it an Indicator. I want to run Indicator class methods (those of ... to clarify anything, let me know. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby on rails 3 - Setting up a polymorphic has_many :through relationship

rails g model Article name:string rails g model Category name:string rails g model Tag name:string taggable_id ... true belongs_to :category end See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

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ruby on rails - form_for but to post to a different action

I want to have a form_for @user, but post to a custom action in the users controller. How can I do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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652 views

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ruby on rails - different layout for sign_in action in devise

I'm trying to use a different/custom layout named "devise" for the sign_in action. I found this page in the ... . I would appreciate any help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

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ruby - Mountain Lion rvm install 1.8.7 x11 error

After update to Mountain Lion, I tried install 1.8.7, and I got error. X11 file not found, I installed Xquarkz, but ... make: *** [all] Error 1 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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516 views

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ruby - List of installed gems?

Is there a Ruby method I can call to get the list of installed gems? I want to parse the output of gem ... there a different way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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600 views

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ruby on rails - Specifying column name in a "references" migration

I want to make a migration in Rails, referencing another table. Usually, I would do something like: add_column :post, : ... ? How can I do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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582 views

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ruby - Protected and private methods in Rails

Method visibility in Ruby (public, protected, and private methods) has been well explained in places like this ... by multiple controllers, etc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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633 views

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ruby on rails - How to implement has_many :through relationships with Mongoid and mongodb?

Using this modified example from the Rails guides, how does one model a relational "has_many :through" ... has timestamp attribute end See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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884 views

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ruby - Ignoring GEM because its extensions are not built

On both my work and home computers, I recently upgraded Ruby to 2.3.1, using ruby-install. I use chruby as ... their fix to the same warning.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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451 views

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ruby - Paperclip::Errors::MissingRequiredValidatorError with Rails 4

I'm getting this error when I try to upload using paperclip with my rails blogging app. Not sure what it is ... material to help you help me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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446 views

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ruby on rails - Using link_to with embedded HTML

I'm using Twitter's Bootstrap stuff and I have the following HTML: <a class="btn" href="<%= user_path(@user) %>" ... "></i> is throwing me off? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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445 views

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ruby - How to create a private class method?

How come this approach of creating a private class method works: class Person def self.get_name persons_name end ... , " + Person.persons_name See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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430 views

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ruby - How to understand the difference between class_eval() and instance_eval()?

Foo = Class.new Foo.class_eval do def class_bar "class_bar" end end Foo.instance_eval do def instance_bar " ... obj's instance variables. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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586 views

1 answer

ruby on rails - unable to install pg gem

I tried using gem install pg but it doesn't seem to work. gem install pg gives this error Temporarily enhancing ... -0.10.1/ext/gem_make.out See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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501 views

1 answer

ruby on rails - Cannot install pg gem in Mavericks with Postgres.app

I am trying to install the pg gem for use with Postgres.app on my local machine. I am running Mavericks. ... help you can offer. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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ruby - Getting "Warning! PATH is not properly set up" when doing rvm use 2.0.0 --default

Above doesn't work first time, works 2nd time. Try to set ruby version to 2.0.0 for any new shell windows. ... current && default # * - default See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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445 views

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ruby - serve current directory from command line

could someone give me a hint, howto serve the current directory from command line with ruby? it would be ... launch it from every directory. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

1 answer

ruby on rails - How to monitor delayed_job with monit

Are there any examples on the web of how to monitor delayed_job with Monit? Everything I can find uses God, ... config based on this question. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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540 views

1 answer

ruby - How do you do relative time in Rails?

I'm writing a Rails application, but can't seem to find how to do relative time, i.e. if given a certain Time ... a month "9/1/2008", etc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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667 views

1 answer

ruby - gem eventmachine fatal error: 'openssl/ssl.h' file not found

Just installed El Capitan and can't install gem eventmachine 1.0.7. openssl is at 1.0.2a-1. Tried to use - ... Error 1 make failed, exit code 2 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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