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Index on multiple columns in Ruby on Rails
...arting at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
Question regarding 'u...
When editing Microsoft Office VBA, how can I disable the popup “Compile error” messages?
...you want to paste into that line. But, if that partial line isn't syntactically valid, the VBA editor interrupts your work by popping up a "Compile error" message that has to be dismissed.
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PendingIntent does not send Intent extras
...city starts RefreshService with a Intent which has a boolean extra called isNextWeek .
3 Answers
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add maven repository to build.gradle
... and dependencies for the classpath of your build script but not your application.
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MySQL join with where clause
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You need to put it in the join clause, not the where:
SELECT *
FROM categories
LEFT JOIN user_category_subscriptions ON
user_category_subscriptions.category_id = categories.category_id
and user_category_subscriptions.user_id =1
See, with an inner join, putting a clause in the join ...
looping through an NSMutableDictionary
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you can use
[myDict enumerateKeysAndObjectsUsingBlock: ^(id key, id obj, BOOL *stop) {
// do something with key and obj
}];
if your target OS supports blocks.
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HTML/CSS: Make a div “invisible” to clicks?
...ransparent <div> over some text. However, this means that the text can't be clicked (eg, to click links or select it). Would it be possible to simply make this div "invisible" to clicks and other mouse events?
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How to delete last character from a string using jQuery?
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You can also try this in plain javascript
"1234".slice(0,-1)
the negative second parameter is an offset from the last character, so you can use -2 to remove last 2 characters etc
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Omitting the first line from any Linux command output
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The tail program can do this:
ls -lart | tail -n +2
The -n +2 means “start passing through on the second line of output”.
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Exception NoClassDefFoundError for CacheProvider
...ew in Spring and hibernate so I'm trying to implement some simple web application based on Spring 3 + hibernate 4
while I start tomcat I have this exception:
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