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Rails 4 multiple image or file upload using carrierwave
...ploader Avatar
Create post scaffold
rails generate scaffold post title:string
Create post_attachment scaffold
rails generate scaffold post_attachment post_id:integer avatar:string
rake db:migrate
In post.rb
class Post < ActiveRecord::Base
has_many :post_attachments
accepts_nested...
What is an 'endpoint' in Flask?
...al way that you might go about creating a view, it actually abstracts some extra info from you. Behind the scenes, Flask did not make the leap directly from URL to the view function that should handle this request. It does not simply say...
URL (http://www.example.org/greeting/Mark) should be handl...
What is the benefit of using Fragments in Android, rather than Views?
... for last year, I was also thinking that Fragments don't provide any extra ordinary feature, but I experienced that after clicking back on activity I was loosing all images downloaded in that, so had to add cache implementation, now I'm thinking using fragments it may be very easy
...
Android splash screen image sizes to fit all devices
...ldpi ~ 120dpi)
Medium Density (mdpi ~ 160dpi)
High Density (hdpi ~ 240dpi)
Extra-High Density (xhdpi ~ 320dpi)
(These dpi values are approximations, since custom built devices will have varying dpi values)
What you (if you're a designer) need to know from this is that Android basically chooses fro...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...表可以使用不同的键类型。比如主服务器用InnoDB，键用VARCHAR的话节省空间，从服务器使用MyISAM，键用CHAR提高速度，因为MyISAM有静态表一说。
主从服务器中的表可以使用不同的索引。主服务器主要用来应付写操作，所以除了主...
When vectors are allocated, do they use memory on the heap or the stack?
... // Can't be on stack - how would the stack "expand"
// to make the extra space required between main and foo?
vec.push_back(Type());
}
int main() {
vector<Type> bar;
foo(bar);
}
Likewise:
vector<Type> *vect = new vector<Type>; //allocates vect on hea...
How to handle multiple heterogeneous inputs with Logstash?
...? And then again, in the if statememt, if the tags were an array or single string, then both IF's would work. So logically this is incorrect, but maybe logstash has a different logic inside if's
– meso_2600
Oct 28 '18 at 18:06
...
Using std Namespace
...
Most C++ users are quite happy reading std::string, std::vector, etc. In fact, seeing a raw vector makes me wonder if this is the std::vector or a different user-defined vector.
I am always against using using namespace std;. It imports all sorts of names into the glo...
Building a minimal plugin architecture in Python
...e too, although you can do a lot with just __import__, os.listdir and some string manipulation.
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Why do you need to invoke an anonymous function on the same line?
...ess function and groups it, but does not call it. The second line groups a string. Both do nothing. (Vincent's first example.)
(function (msg){alert(msg)});
('SO'); // nothing.
(foo);
(msg); //Still nothing.
But
(foo)
(msg); //works
...