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How do you delete an ActiveRecord object?
...r.where(age: 20).destroy_all
User.destroy_all(age: 20)
Alternatively you can use delete and delete_all which won't enforce :before_destroy and :after_destroy callbacks or any dependent association options.
User.delete_all(condition: 'value') will allow you to delete records
without a primary...
Hibernate problem - “Use of @OneToMany or @ManyToMany targeting an unmapped class”
...g my feet with Hibernate Annotations and I've hit a problem I hope someone can help with.
7 Answers
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What is the difference between “Include Directories” and “Additional Include Directories”
...or "Include Directories". But under "C/C++" option, there is another entry called "Additional Include Directories". Same thing happens with library directories.
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When increasing the size of VARCHAR column on a large table could there be any problems?
... @CodeNaked: this is a lot trickier to answer. (max) is a LOB type which can be "in row" or outside the row. However, I'm inclined to say it should be the same because the data is already "in row" and no table rebuild would be needed
– gbn
Oct 23 '14 at 7:52
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How can I list (ls) the 5 last modified files in a directory?
I know ls -t will list all files by modified time. But how can I limit these results to only the last n files?
5 Answe...
Multiple select statements in Single query
...T(*)
FROM user_table
) AS tot_user,
(
SELECT COUNT(*)
FROM cat_table
) AS tot_cat,
(
SELECT COUNT(*)
FROM course_table
) AS tot_course
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HTML/Javascript change div content
...ry or some other library that makes this sort of thing easier for you, you can just use the element's innerHTML property.
document.getElementById("content").innerHTML = "whatever";
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Strange \n in base64 encoded string in Ruby
... Apparently this exists to maintain backwards compat with software that cannot handle long lines. stackoverflow.com/a/20065991/5749914
– Warlike Chimpanzee
Aug 21 '17 at 23:57
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Why start a shell command with a backslash?
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Aliases can be used in scripts by using shopt -s expand_aliases before use of the alias
– Alex
Mar 28 '13 at 21:06
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django 1.5 - How to use variables inside static tag
...lem, in some places I use variables to get the content. With the new tag I can't, is there any way to solve this?
5 Answers...