大约有 2,000 项符合查询结果（耗时：0.0170秒） [XML]
Get Specific Columns Using “With()” Function in Laravel Eloquent
...
User::with(array('post'=>function($query){
$query->select('id','user_id');
}))->get();
Don't forget to include the foreign key (assuming it is user_id in this example) to resolve the relationship, otherwise you'll get zero results for your relation.
...
Get column index from column name in python pandas
... .get_loc():
In [45]: df = DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})
In [46]: df.columns
Out[46]: Index([apple, orange, pear], dtype=object)
In [47]: df.columns.get_loc("pear")
Out[47]: 2
although to be honest I don't often need this myself. Usually access by name does ...
Postgresql query between date ranges
...ecome simpler if you use >= start AND < end.
For example:
SELECT
user_id
FROM
user_logs
WHERE
login_date >= '2014-02-01'
AND login_date < '2014-03-01'
In this case you still need to calculate the start date of the month you need, but that should be straight forward in an...
Linux command or script counting duplicated lines in a text file?
...cal, ordered list:
echo "red apple
> green apple
> green apple
> orange
> orange
> orange
> " | sort -u
?
green apple
orange
red apple
or
sort -u FILE
-u stands for unique, and uniqueness is only reached via sorting.
A solution which preserves the order:
echo "red appl...
How do I handle too long index names in a Ruby on Rails ActiveRecord migration?
...
Provide the :name option to add_index, e.g.:
add_index :studies,
["user_id", "university_id", "subject_name_id", "subject_type_id"],
:unique => true,
:name => 'my_index'
If using the :index option on references in a create_table block, it takes the same options hash as add_index...
AngularJS passing data to $http.get request
...ams.
$http({
url: user.details_path,
method: "GET",
params: {user_id: user.id}
});
See: http://docs.angularjs.org/api/ng.$http#get and https://docs.angularjs.org/api/ng/service/$http#usage (shows the params param)
...
Why does “split” on an empty string return a non-empty array?
...
If you split an orange zero times, you have exactly one piece - the orange.
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How to automatically generate N “distinct” colors?
... slightly mint green) is imperceptible, while the difference between 30° (orange) and 45° (peach) is quite obvious. You need a non-linear spacing along the hue for best results.
– Phrogz
Feb 21 '12 at 17:05
...
How can I change the table names when using ASP.NET Identity?
...ers" you can also change the field names the default Id column will become User_Id.
modelBuilder.Entity<IdentityUser>()
.ToTable("Users", "dbo").Property(p => p.Id).HasColumnName("User_Id");
or simply the below if you want to keep all the standard column names:
model...
How can I explode and trim whitespace?
..._split ('/(\s*,*\s*)*,+(\s*,*\s*)*/', 'red, green thing ,, ,, blue ,orange');
Result:
Array
(
[0] => red
[1] => green thing
[2] => blue
[3] => orange
)
This
Splits on commas only
Trims white spaces from each item.
Ignores empty items
Does not split an item...