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Check Whether a User Exists
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You can also check user by id command.
id -u name gives you the id of that user.
if the user doesn't exist, you got command return value ($?)1
And as other answers pointed out: if all you want is just to check if the user exists, use if with id directly, as i...
Switch statement fallthrough in C#?
...# had not yet added any "soft" keywords (like 'yield', 'var', 'from', and 'select'), so they had three real options: 1) make 'fallthrough' a hard keyword (you cant use it as a variable name), 2) write code necessary to support such an soft keyword, 3) use already reserved keywords. #1 was a big issu...
Why does Haskell's “do nothing” function, id, consume tons of memory?
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We know the type of id,
id :: a -> a
And when we specialize this for id id, the left copy of id has type:
id :: (a -> a) -> (a -> a)
And then when you specialize this again for the leftmost id in id id id, you get:
id :: ((a -> a) -> (a -> ...
ViewParam vs @ManagedProperty(value = “#{param.id}”)
...;f:viewAction> for that instead.
Allows for nested <f:converter> and <f:validator> for more fine-grained conversion/validation. Even a <h:message> can be attached.
Can be included as GET query string using includeViewParams attribute of <h:link> or includeViewParams=true...
Preventing Laravel adding multiple records to a pivot table
I have a many to many relationship set up and working, to add an item to the cart I use:
5 Answers
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Rest with Express.js nested router
... Very thorough answer! One question: for the sake of encapsulation and separation of knowledge between the user router and the item router is there a declarative way to specify that a subrouter requires a parameter? In other words, is there an explicit way to write the registration or access...
Parse query string into an array
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You want the parse_str function, and you need to set the second parameter to have the data put in an array instead of into individual variables.
$get_string = "pg_id=2&parent_id=2&document&video";
parse_str($get_string, $get_array);
print_r($g...
Build vs new in Rails 3
...rm.client.new is creating a new Client object from the clients collection, and so it can automatically set the firm_id to some_firm.id, whereas the docs are calling Client.new which has no knowledge of any Firm's id at all, so it needs the firm_id passed to it.
The only difference between some_firm...
Contain form within a bootstrap popover?
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I would put my form into the markup and not into some data tag.
This is how it could work:
JS Code:
$('#popover').popover({
html : true,
title: function() {
return $("#popover-head").html();
},
content: function() {
return $("#pop...
Another Repeated column in mapping for entity error
...lumn in the mapping. That means you mapped the same database column twice. And indeed, you have:
@Column(nullable=false)
private Long customerId;
and also:
@ManyToOne(optional=false)
@JoinColumn(name="customerId",referencedColumnName="id_customer")
private Customer customer;
(and the same goes...