irb | IRB stands for `` interactive Ruby | Interpreter library
kandi X-RAY | irb Summary
kandi X-RAY | irb Summary
IRB stands for "interactive Ruby" and is a tool to interactively execute Ruby expressions read from the standard input. The irb command from your shell will start the interpreter.
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Top functions reviewed by kandi - BETA
- Evaluate the input .
- Handle error message .
- set inspect mode
- Save history of history
- Wrap the code of the binding code in the context of the binding
- Outputs the result of a block .
- Loads a file in an IO object
- Try to load an IO object
- Returns an array containing all jobs in the jobs that are printed .
- Loads the ruby file into the given file .
irb Key Features
irb Examples and Code Snippets
Community Discussions
Trending Discussions on irb
QUESTION
In an effort to create a Short, Self Contained, Correct (Compilable), Example, imagine that I want to do the following.
I have a blog website. There are two types of posts, TextPost and LinkPost. There are also two types of users, User and Guest. I would like to implement Multiple Table Inheritance with TextPost and LinkPost, by which I mean (hopefully I'm using the term correctly):
- At the model level, I will have
Post,TextPostandLinkPost.TextPostandLinkPostwill inherit fromPost. - At the database level, I will have tables for the "leaf" models of
TextPostandLinkPost, but not forPost.
Each type of Post can belong to either a User or a Guest. So we have a polymorphic belongs_to situation.
My question is how to accomplish these goals.
I tried the following, but it doesn't work.
...ANSWER
Answered 2021-Jun-12 at 04:58The names of constants look like the names of local variables, except that they begin with a capital letter.
All the built-in classes, along with the classes you define, have a corresponding global constant with the same name as the class called
class name.
So in your case, when you define User class, there's a constant class name: User, but not user, that why the error NameError (wrong constant name user) is raised.
try text_post = TextPost.create(title: 'foo', content: 'lorem ipsum', author_id: 1, author_type: 'User')
QUESTION
My Rails app runs with nginx's www-data user and all disk write functions are owned by www-data and so all the app's related disk stored assets are owned by www-data. Sometimes I need to raise the Rails console and perform actions that touch or create stored assets and I do not want these touched/created assets to become owned by root or another admin user, I want them to remain owned by the www-data user. This worked fine under ruby 1.9.3 -> 2.6.x:
...ANSWER
Answered 2021-Jun-09 at 16:42I believe all you have to do is configure the HOME variable to your command so it looks like:
QUESTION
This is my Dockerfile.
...ANSWER
Answered 2021-Jun-09 at 12:52You can achieve what you want with docker-compose run:
QUESTION
This might be an easy question but I was unfortunately not able to find the answer on Google.
Context:
I am working on a project of my own, and I am externalizing some code in a gem (FrenchTaxSystem). It is the first I create a gem and I have difficulties using it properly.
Problem:
When calling a method (like testit) defined in the main file (french_tax_system.rb) of my gem I get a "NoMethodError: undefined method `testit' for FrenchTaxSystem:Module", though I can call constants from this same file (like FISCAL_NB_PARTS_FOR_MARRIED_COUPLE) and it puzzles me.
E.g in IRB I get that when calling a method: [ And it is the same in my Rspecs tests inside my gem
However when calling a constant I have no error:
Main file in my gem:
french_tax_system.rb
ANSWER
Answered 2021-Jun-07 at 16:43This should work:
QUESTION
I have my third-party credentials set in the config/application.rb like a key, UUID, and other values.
...ANSWER
Answered 2021-Jun-04 at 05:59Where no other mechanism exists, you can use Object#send or Object#public_send to call a dynamic method name. For example:
QUESTION
I seem to run into a some kind of circular relationships that the two solutions in the gem's documentation won't solve for me. See the example below. Is this meant to be done differently?
One would argue that because one object could not really be persisted without the other they ought to just be one model. I think it's better to extract all the logic regarding authentication to it's seperate model in order not to bloat the user. Most of the time credential stuff is only used when creating sessions, whereas the user is used all the time.
...ANSWER
Answered 2021-May-29 at 23:37The model that has the foreign key, in this case Credential, is the one that is required to have a user_id value to be persisted. This means that there needs to be a user (either in memory or in the database) before creating a credential. This is the reason why using build works for you.
If the user exists in memory, rails will be smart enough to create that one first before creating the credential. It seems to me that when you use build with Fabricate it’s initializing a user and a credential so when the user is saved, it saves the credential with the newly created user.
Note that the docs use this syntax for belongs_to, not has_one. It seems that you may need to refer to the callbacks section of the documentation to fix this issue.
QUESTION
I need to upload image with Shrine using uploader, I have default uploader from example here including few derivatives.
Like here https://shrinerb.com/docs/getting-started
But I want to create new instance inside IRB, and I don't figure it out how to pass image properly to the Shrine. As I will finish it it will be used in a script for converting bunch of images.
If I do this:
...ANSWER
Answered 2021-May-28 at 05:28I have a solution.
Shrine uploader needs a File object opened in binmode, so
QUESTION
I am trying to write a regex-replace pattern in order to replace a number in a hash like such:
...ANSWER
Answered 2021-May-22 at 00:18The reason is that Ruby's Onigmo regex engine does not support infinite-width lookbehind patterns.
In a general case, positive lookbehinds that contain quantifiers like *, + or {x,} can often be substituted with a consuming pattern followed with \K:
QUESTION
Consider this Ruby code:
...ANSWER
Answered 2021-May-20 at 16:18require is implemented inside the VM, so it has access to internal functionality that normal Ruby code does not. For example it can manually escape its current scope and execute code at the top level. That is "how".
As for "why"? Imagining if you could require into a specific scope, this would be extremely prone to breakage since it would change top-level self from main (which is an Object) to... anything (in your example it would be A, which is a Class). It would be very hard to predict in general what would happen when your code is required.
By always executing loaded code at the top-level, the result is always consistent. And you can use the built-in hook mechanisms (included, extended, prepended, inherited) to access specific selfs from the scope that loaded you.
QUESTION
from the json below I need to gather the interface name and the unit name value in a loop. This is partial output of my json:
...ANSWER
Answered 2021-May-19 at 00:37Iterate with_subelements, e.g.
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