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how to permit an array with strong parameters
...y
params.require(:question).permit(:question_details, :question_content, :user_id, :accepted_answer_id, :province_id, :city, :category_ids => [])
Works perfectly now!
(IMPORTANT: As @Lenart notes in the comments, the array declarations must be at the end of the attributes list, otherwise you'...
Using Razor within JavaScript
...reating a helper code, one exists already. We use this all the time @Html.Raw(Json.Encode(Model))
– PJH
Jan 29 '14 at 14:47
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What is the difference between new/delete and malloc/free?
...object, delete call the dtor.
malloc & free just allocate and release raw memory.
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How to get key names from JSON using jq
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In combination with the above answer, you want to ask jq for raw output, so your last filter should be eg.:
cat input.json | jq -r 'keys'
From jq help:
-r output raw strings, not JSON texts;
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Sanitizing strings to make them URL and filename safe?
...and see if all this works. If not then I'll probably have to drop back to (raw)?urlencode() to allow UTF-8. I'll post back results here.
– Xeoncross
Apr 24 '10 at 16:27
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delete_all vs destroy_all?
...l
You can do :
u = User.find_by_name('JohnBoy')
UsageIndex.destroy_all "user_id = #{u.id}"
The result is one query to destroy all the associated records
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Where are Docker images stored on the host machine?
... only this file:
~/Library/Containers/com.docker.docker/Data/vms/0/Docker.raw
that contains the Docker Disk and all the images and containers within it.
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Show percent % instead of counts in charts of categorical variables
...(data=data.frame(xx),aes(x=xx))+
geom_bar(aes(y = (..count..)),fill="orange")
q=q+ geom_text(aes(y = (..count..),label = scales::percent((..count..)/sum(..count..))), stat="bin",colour="darkgreen")
q
}
perbar(mtcars$disp)
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What is the meaning of the CascadeType.ALL for a @ManyToOne JPA association
...dresses {
@ManyToOne(cascade = CascadeType.REFRESH) @JoinColumn(name = "user_id")
protected User addressOwner;
}
This way you dont need to worry about using fetch in annotations. But remember when deleting the User you will also delete connected address to user object.
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How to delete a file or folder?
...###Exception Handling
#!/usr/bin/python
import os
## Get input ##
myfile= raw_input("Enter file name to delete: ")
## Try to delete the file ##
try:
os.remove(myfile)
except OSError as e: ## if failed, report it back to the user ##
print ("Error: %s - %s." % (e.filename, e.strerror))
###...