Recent questions tagged ruby

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ruby on rails - What's the difference between belongs_to and has_one?

What is the difference between a belongs_to and a has_one? Reading the Ruby on Rails guide hasn't helped 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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540 views

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ruby on rails - Add a default value to a column through a migration

How do I add a default value to a column that already exists through a migration? All the documentation I can find ... but in this case it does. See Question&Answers more detail:os...

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

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725 views

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ruby on rails f.select options with custom attributes

I have a form select statement, like this: = f.select :country_id, @countries.map{ |c| [c.name, c.id] } ... ="YYY">Argentina</option> ... 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 - Why isn't the eigenclass equivalent to self.class, when it looks so similar?

I've missed the memo somewhere, and I hope you'll explain this to me. Why is the eigenclass of an ... sneaky trick of Ruby meta-programming? See Question&Answers more detail:os...

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

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437 views

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ruby - When should I use Struct vs. OpenStruct?

In general, what are the advantages and disadvantages of using an OpenStruct as compared to a Struct? What type of ... would fit each of these? 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 - How can I install a local gem?

If I download a .gem file to a folder in my computer, can I install it later using gem install? See Question&Answers more detail:os...

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

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573 views

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ruby on rails - Float vs Decimal in ActiveRecord

Sometimes, Activerecord data types confuse me. Err, often. One of my eternal questions is, for a given case, Should ... know which type to use? See Question&Answers more detail:os...

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

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421 views

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ruby - What's the best way to model recurring events in a calendar application?

I'm building a group calendar application that needs to support recurring events, but all the solutions I've come up ... that's good to 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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521 views

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ruby on rails - How to match accented characters with a regex?

I am running Ruby on Rails 3.0.10 and Ruby 1.9.2. I am using the following Regex in order to match names: NAME_REGEX = / ... è, é, ì, ò, ù, ...? See Question&Answers more detail:os...

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

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502 views

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ruby - Using WWW:Mechanize to download a file to disk without loading it all in memory first

I'm using Mechanize to facilitate the downloading of some files. At the moment my script uses the following ... Mechanize's cookies with it? 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 on rails - How can I remove a default gem? ! want to uninstall a gem 1.7.7 version of json

I have the same rails app in OSX and Ubuntu, I want to use Zeus to speed up my rspec. In Ubuntu, Zeus ... a default gem What should I do? See Question&Answers more detail:os...

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

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316 views

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ruby on rails - Uploading multiple files with paperclip

I am having problems uploading multiple files using paper clip, my models are as such slider has_many ... Cancel', slider_index_path %> See Question&Answers more detail:os...

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

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395 views

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ruby - Why use "self" to access ActiveRecord/Rails model properties?

Throughout my application self. is not necessary to refer to a User's name. name works fine. Why does the following ... is given. Rails 3.0.7. 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

1 answer

ruby on rails - How to delete duplicate records in mysql database?

What's the best way to delete duplicate records in a mysql database using rails or mysql queries? See Question&Answers more detail:os...

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

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468 views

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ruby on rails - Rspec and named routes

I'm quite new to rails, and trying to follow the railstutorial. Everything goes fine, except for my tests which can' ... and didn't find any ^^' See Question&Answers more detail:os...

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

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339 views

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ruby - Where is the Rails method that converts data from `datetime_select` into a DateTime object?

When I use <%= f.datetime_select :somedate %> in a form, it generates HTML like: <select id="some_date_1i" ... a solution to that other problem. See Question&Answers more detail:os...

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

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350 views

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ruby - How can I capture STDOUT to a string?

puts "hi" puts "bye" I want to store the STDOUT of the code so far (in this case hi bye into a variable ... " line should give me hi and bye. See Question&Answers more detail:os...

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

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455 views

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ruby on rails 3 - Does accepts_nested_attributes_for work with belongs_to?

I have been getting all kinds of conflicting information regarding this basic question, and the answer is pretty ... city f.submit "Submit" See Question&Answers more detail:os...

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

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592 views

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ruby on rails - Undefined method raise_in_transactional_callbacks=' for ActiveRecord::Base:Class (NoMethodError)

Before writing this question I looked at these answers, but was unable to find a solution.: Error when execute ... be grateful for 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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392 views

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ruby on rails - counter_cache with has_many :through

I just created a counter_cache field and the controller looks like this. @users = User.where(:sex => 2) ... , :counter_cache => :received_likes See Question&Answers more detail:os...

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

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533 views

1 answer

ruby - How to get a Date from date_select or select_date in Rails?

Using select_date gives me back a params[:my_date] with year, month and day attributes. How do get a Date ... use date_select instead as well. See Question&Answers more detail:os...

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

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851 views

1 answer

ruby on rails - Sass::SyntaxError: File to import not found or unreadable: bootstrap-sprockets

I am suddenly getting this error in development and in production on deployment. custom.css.scss ... 20141001060418/vendor/assets/stylesheets See Question&Answers more detail:os...

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

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1.5k views

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ruby - Gem installation error: You have to install development tools first

I tried installing the gem 'sinatra-websocket', but when I ran gem install sinatra-websocket, I got this error... ... .", but is that relevant? See Question&Answers more detail:os...

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

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442 views

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ruby - Safe ActiveRecord like query

I'm trying to write LIKE query. I read that pure string quires aren't safe, however I couldn't find ... I manually defend against SQL Injection? See Question&Answers more detail:os...

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

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389 views

1 answer

ruby - How to deal with the sum of rounded percentage not being 100?

Suppose we have a list of items with an integer: USA: 3 people Australia: 2 people Germany: 2 people If we ... How would you solve this problem? 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

1 answer

ruby on rails - exif image rotation issue using carrierwave and rmagick to upload to s3

I've got a photo upload feature in my rails app. The app uploads direct to s3 through carrierwave via rmagick ... for setting up my s3 upload. See Question&Answers more detail:os...

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

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436 views

1 answer

ruby on rails - Visit method not found in my rspec

My java web application is running on tomcat at http://localhost:8080/ Writing my first spec, home_spec: ... : require 'capybara/rspec' See Question&Answers more detail:os...

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

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514 views

1 answer

ruby on rails - link_to :confirm displays popup twice

This tag with rails 3 <%= link_to 'Destroy', item, :method => :delete,:confirm=>'Are you sure?' %> ... twice. What could be causing 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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