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Rails: where does the infamous “current_user” come from?
...
It is defined by several gems, e.g. Devise
You'll need to store the user_id somewhere, usually in the session after logging in. It also assumes your app has and needs users, authentication, etc.
Typically, it's something like:
class ApplicationController < ActionController::Base
def cu...
How do I execute a stored procedure once for each row returned by query?
... have a stored procedure that alters user data in a certain way. I pass it user_id and it does it's thing. I want to run a query on a table and then for each user_id I find run the stored procedure once on that user_id
...
A migration to add unique constraint to a combination of columns
...ngs_to :post, foreign_key: true, null: false
end
add_index :ownerships, [:user_id, :post_id], unique: true
Trying to create two similar records will throw a database error (Postgres in my case):
ActiveRecord::RecordNotUnique: PG::UniqueViolation: ERROR: duplicate key value violates unique const...
How to check if a user likes my Facebook Page or URL using Facebook's API
... if (response && response.authResponse) {
var user_id = response.authResponse.userID;
var fql_query = "SELECT uid FROM page_fan WHERE page_id = "+page_id+"and uid="+user_id;
FB.Data.query(fql_query).wait(function(rows) {
if (rows.len...
Validate uniqueness of multiple columns
...cope a validates_uniqueness_of call as follows.
validates_uniqueness_of :user_id, :scope => :friend_id
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How do you use the “WITH” clause in MySQL?
...bers, this stored procedure will help:
----------------------------------
user_id | team_id
----------------------------------
admin | NULL
ramu | admin
suresh | admin
kumar | ramu
mahesh | ramu
randiv | suresh
-----------------------------------
Code:
DROP ...
Facebook API - How do I get a Facebook user's profile image through the Facebook API (without requir
...nal width and height fields as URL parameters:
https://graph.facebook.com/USER_ID/picture?width=WIDTH&height=HEIGHT
where WIDTH and HEIGHT are your requested dimension values.
This will return a profile picture with a minimum size of WIDTH x HEIGHT while trying to preserve the aspect ratio. ...
Automatically deleting related rows in Laravel (Eloquent ORM)
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You can actually set this up in your migrations:
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
Source: http://laravel.com/docs/5.1/migrations#foreign-key-constraints
You may also specify the desired action for the "on delete" and "on
update"...
2025年8月9日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
...动生成的,如果您还未签到,请点此进行签到的操作. 我在 2025-08-09 08:19 完成签到,是今天第一个签到的用户,获得随机奖励 小红花 10,另外我还额外获得了 小红花 10.我今天最想说:「该会员没有填写今日想说内容.」. 我在 2025-08-09 08:2...
Rails: Adding an index after adding column
...exToTable < ActiveRecord::Migration
def change
add_index :table, :user_id
end
end
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