Arvind Kushwah Web Developer and Software Consultant

By the looks of what you are trying to send, you need to change the Grape restriction, because destinations is an Array , not a Hash : requires : destinations , type : Array   You don't need the "destination" hash when sending the request: { destinations => [ { name => 'dest1' , other_attribute : 'value' , etc ... }, { name => 'dest2' , other_attribute : 'value' , etc ... }, { name => 'dest3' , other_attribute : 'value' , etc ... } ]}   This creates an Array of hashes. In order to send this through POSTMAN, you'll need to modify that destinations param your sending and add multiple lines in POSTMAN. Something like: destinations [][ name ] 'dest1' destinations [][ other_attribute ] 'value1' destinations [][ name ] 'dest2' destinations [][ other_attribute ] 'value2'

1- Create message model:-  rails g model message sender_id:integer recepient_id:integer body:text 2- Define Assosciation and scopes:-  class Message < ActiveRecord::Base     belongs_to :sender,      :class_name => 'User',      :foreign_key => 'sender_id'     belongs_to :recepient,      :class_name => 'User',      :foreign_key => 'recepient_id'     scope :conversations, lambda{|sender_id,recepient_id| where('sender_id = ? AND recepient_id = ? ',sender_id, recepient_id ).order("created_at DESC")}     scope :friends_conversations, lambda{|recepient_id,sender_id| where('sender_id = ? AND recepient_id = ? ',sender_id, recepient_id ).order("created_at DESC")} end 3- User model:- class User < ActiveRecord::Base  has_many :received_messages,  :class_name => 'Message',  :foreign_key => 'recepient_id'  has_many :sent_messages,  :class_name => 'Message'

Share Internet Connection With Android in Ubuntu 14.04 June 8, 2014 —  127 Comments This quick tip is going to show you how to create wifi hotspot in Ubuntu 14.04 so that you can share a wired internet connection with Android devices through your wireless card. I’ve written about this in another post using a third-party app called ap-hotspot , but some readers said that not work. The pre-installed Network Manager in Ubuntu Unity does not support Access Point (AP) mode which is required for Android devices. Fortunately, KDE’s connection editor support this mode, below is how: NOTE: To do below steps, your Wireless Card must support Access Point (AP) mode. 1. Click the link below to bring up Ubuntu Software Center and click install kde-nm-connection-editor: Click Install KDE’s Network Manager 2. Once installed, press Alt+F2 and run command to launch the app: kde-nm-connection-editor 3. Cli

sudo -u postgres psql   Postgresql to csv file:-   COPY products TO '/home/products.csv' DELIMITER ',' CSV HEADER ; CSV to Postgresql table:-   COPY products FROM '/home/products.csv' DELIMITER ',' CSV HEADER ;   products is table name.