```ruby
# frozen_string_literal: true

#= Utilities
class Utils
  # Take a list of items (ie, course ids) and breaks it into chunks of 50.
  def self.chunk_requests(items, chunk_size=50)
    blocks = items.each_slice(chunk_size).to_a
    results = []
    blocks.each do |b|
      info = yield b
      results.push(*info)
    end
    results
  end

  def self.parse_json(data)
    begin
      data = JSON.parse data
    rescue JSON::ParserError => e
      Rails.logger.error "Caught #{e}"
    end
    data
  end

  def self.run_on_all(model, method, array)
    array = [array] if array.is_a? model
    model.transaction do
      (array || model.ready_for_update).each(&method)
    end
  end
end
```

Use concat instead of push to avoid stack too deep error
user
```ruby
# frozen_string_literal: true

#= Utilities
class Utils
  # Take a list of items (ie, course ids) and breaks it into chunks of 50.
  def self.chunk_requests(items, chunk_size=50)
    blocks = items.each_slice(chunk_size).to_a
    results = []
    blocks.each do |b|
      info = yield b
      results.concat [*info]
    end
    results
  end

  def self.parse_json(data)
    begin
      data = JSON.parse data
    rescue JSON::ParserError => e
      Rails.logger.error "Caught #{e}"
    end
    data
  end

  def self.run_on_all(model, method, array)
    array = [array] if array.is_a? model
    model.transaction do
      (array || model.ready_for_update).each(&method)
    end
  end
end
```
assistant