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Trying to understand the shovel operator with strings


Trying to understand the shovel operator with strings

By : Jason Lian
Date : November 19 2020, 03:01 PM
hope this fix your issue When you set hi = original_string your hi variable is just a new variable pointed at the same object. If you look at hi.object_id and original_string.object_id you will find they are the same. If you want a clone of an object that you can manipulate without impacting the original_string, you'll need to say something like hi = original_string.clone or hi = original_string.dup.
code :


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RabbitMQ configuring dynamic shovel error - 'component shovel not found'

RabbitMQ configuring dynamic shovel error - 'component shovel not found'


By : Nick
Date : March 29 2020, 07:55 AM
it fixes the issue Looks like dynamic shovels were added in 3.3.0, doh! We're still on 3.2.3.
http://www.rabbitmq.com/release-notes/README-3.3.0.txt
Rails ActiveRecord Shovel (<<) Operator

Rails ActiveRecord Shovel (<<) Operator


By : Verso
Date : March 29 2020, 07:55 AM
like below fixes the issue When you use the shovel operator (<<), Rails automatically saves the associated object. So, when you do this:
code :
self.comments << @new_comment
In Ruby, how does the shovel operator (<<) work on two integers?

In Ruby, how does the shovel operator (<<) work on two integers?


By : Alaric
Date : March 29 2020, 07:55 AM
Hope this helps The operation is called “bitwise left shift” and is easily googlable by this term.
In short, it takes the binary representation of the LHO and shifts it to the left by count, specified as RHO.
code :
0000 0000 0000 0101
00 0000 0000 0101 00 # = 0000 0000 0001 0100
5 << 2
#⇒ 20
m << n ≡ m × 2ⁿ

5 << 4 #⇒ 5 × 2⁴ ≡ 80
#⇒ 80
Why can't I use the shovel operator to set uri.query?

Why can't I use the shovel operator to set uri.query?


By : Brandon Murray
Date : March 29 2020, 07:55 AM
I wish this helpful for you Because the parsed URL passed to the constructor had no query, so it was nil, the path is created as an empty string. Setting query to an empty string will allow this.
This is only for example as there are better ways to set it than the shovel operator.
code :
irb(main):001:0> require 'uri'
=> true
irb(main):002:0> uri = URI('http://example.com')
=> #<URI::HTTP http://example.com>
irb(main):003:0> uri.path
=> ""
irb(main):004:0> uri.query
=> nil
irb(main):005:0> uri.query = ""
=> ""
irb(main):006:0> uri.query << 'p1=value1&p2=value2'
=> "p1=value1&p2=value2"
irb(main):007:0> uri
=> #<URI::HTTP http://example.com?p1=value1&p2=value2>
irb(main):011:0> uri.query =+ 'p1=value1&p2=value2'
=> "p1=value1&p2=value2"
irb(main):012:0> uri
=> #<URI::HTTP http://example.com?p1=value1&p2=value2>
Ruby idiom to shovel into a string or nil? (e.g. shovel or assign / safe shovel)

Ruby idiom to shovel into a string or nil? (e.g. shovel or assign / safe shovel)


By : victor7k
Date : March 29 2020, 07:55 AM
around this issue I'd like to do this: , You can solve this with something like this; with the help of ||.
code :
summary = (summary || '') + reason
(summary ||= '') << reason
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