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<div class="source-fields">
  <%= text_field_tag 'post[sources][]', source %>
  <%= link_to '#', class: 'remove-section', data: { target: '.source-fields' } do %>
    Remove
  <% end %>
</div>

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post[sources][]: "https://one.example.com"
post[sources][]: "https://two.example.com"

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<div class="field">
  <%= f.label :body %>
  <%= f.text_area :body, size: '100x10' %>
</div>

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irb> post = Post.new
=> #<Post id: nil, title: nil, content: {"sources"=>[]}, created_at: nil, updated_at: nil, body: nil, sources: []>
irb> post.body
=> nil
irb> post.sources
=> []

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jsonb_accessor :content,
  body: :string,
  sources: [:JSON, array: true, default: []]

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rails generate model Post title:string content:JSONB

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/*
 * FUNCTION CALLBACK WAY
 */
connection.query({
    sql : "SELECT * FROM Queue WHERE id = ? AND deleted_at IS NULL",
    values : [req.params.queueId],
}, function (err, results, fields) {
    if (err) {
        // TODO error logging
        console.log(err);

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/*
 * FIRST WAY
 */
var queue;
connection2.query(
    'SELECT * FROM Queue WHERE id = ? AND deleted_at IS NULL',
    [req.params.queueId]
).then(results => {
    queue = results[0];
    // if queue exists, delete it

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for(int i = 0, total = 0, max = 55; i <= max + 1; total += i, i++) if (i == max + 1) System.out.println(total);

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int max = 55;
int total = 0;
for(int i = 0; i <= max; i++)
    total += i;
System.out.println(total);