How to pass hash in Postman

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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'
destinations[][name]                'dest3'
destinations[][other_attribute]     'value3'
 
Hope this answers your questions. Let me know if this is what you were looking for.
Experienced Ruby on Rails and Web Developer having 11+ years experience in Ruby & Ruby on Rails framework, TTD, Rspec. Expert on Git, SVN , Git Hook, Bitbucket. I use MySQL, MongoDB , PostgreSQL & Sqlite for Database Management. In front-end development I use HTML5 / HAML, CSS3 / SCSS, javascript / coffeescript. I also know about the deploy the applications on VPS Server i.e AWS EC2, Heroku, Ditital Ocean, Hostgator, Site5, BlueHost, AWS Load Balancing, Elastic Beanstalk, AWS S3 e.t.c ☆ Frameworks ☆ Ruby on Rails, Sinatra ☆ Database ☆ - PostgreSQL, MySQL, SQLite, - MongoDB, Amazon DynamoDB,AWS RDS. ☆ Front end Techniques ☆ - ReactJS, Angular js, Node js, Javascript, JQuery, HTML, CSS - Twitter Bootstrap, Coffeescript. Why hire me? * Master degree in Computer Science * 6 years professional experiences and 10+ projects completed * Available all day long, 7 days/24 hours * Good communication skills with fluent English * Self-motivated, fast-learner and "I can do" mind * Quality insurance and fast delivery

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