kagemusha

Rails 3.2

1. In initializers/mime_types.rb

2. Detection of Mobile Device 

I put this is a file called mobile.rb in app/util
module Mobile
  #optional for testing
  TEST_MOBILE_DEV = false    #set true to test on browser

kagemusha

url = location.href

e.g. to get anchor
anchor = location.href.split('#')[1]

kagemusha

Tested on: Rails 3.2.1

Will get error if don't add :foreign_key to has_many side of relat:

e.g.
class Song  < ActiveRecord::Base
  belongs_to :creator, :class_name=>"User" #person who added song entry

class User < ActiveRecord::Base
  has_many :created_songs, :class_name=>"Song", :foreign_key => 'creator_id'

kagemusha

Database (PG):
reset db:   heroku pg:reset DATABASE_URL  
  - type exactly like this DATABASE_URL is assigned by Heroku 
  - will ask you to confirm your app db)

db:*   heroku run rake db:*
  - e.g. heroku run rake db:migrate

kagemusha

Ref: jquery-rails 1.0.19  (jquery ui 1.8x)


$.datepicker.formatDate 'yy-mm-dd', (new Date(obj.created_at))


If u need time need to do it separately

kagemusha

Seen on: Datatables 1.8.x

1.  c[b[0]] is undefined

Check aoColumns prop.  E.g. if obj.name below not defined will cause error.  If are using

  "aoColumns": [
    { "sWidth": '200px', "mDataProp": "obj.name" },

If are setting col val in "fnRowCallback" prop, set mDataProp to null to avoid this problem.

kagemusha

Versions: Datatables 1.8.x

If get error such as:

DataTables warning (table id = 'myTable'): Requested unknown parameter '2' 
from the data source for row 0

Means num of columns in table heading and in data as specified in 
aoColumns do not match.  Making sure are same number should fix this.

kagemusha

Get the Heroku db as detailed here:
http://devcenter.heroku.com/articles/pgbackups#exporting_via_a_backup

1. heroku pgbackups:capture
2. heroku pgbackups:url <backup_num>  #=>backup_url
   -  get backup_num with cmd "heroku pgbackups"
3. curl -o latest.dump <backup_url>

Then locally do:
$ pg_restore --verbose --clean --no-acl --no-owner -h localhost -U myuser -d mydb latest.dump

kagemusha

Tested on: Datatable 1.8.2, Rails 3.1.3
This example uses Coffeescript and Haml (you should too :-) )

The following is an example of Datatables server-side processing of a table 
which displays a user's song list including the songs' artist names.  In 
Rails, Song and Artist are ActiveRecord models in a one artist-many song relat.

1a. the Rails controller code

class SongsController < ApplicationController

kagemusha

Tested on: Databables 1.8.2


Datatables comes with controls for filtering and pagination.  These can be shown and hidden in a couple of ways (all examples in coffeescript):

Way 1 

    $("#myTable").dataTable
      "bPaginate": false,  #hide pagination control
      "bFilter": false     #hide filter control