Class: Decidim::Admin::Import::Readers::JSON

Inherits:
Base
  • Object
show all
Defined in:
lib/decidim/admin/import/readers/json.rb

Overview

Imports any exported JSON file to local objects. It transforms the import data using the creator into the final target objects.

Constant Summary collapse

MIME_TYPE = 
"application/json"

Instance Method Summary collapse

Methods inherited from Base

first_data_index, #initialize

Constructor Details

This class inherits a constructor from Decidim::Admin::Import::Readers::Base

Instance Method Details

#example_file(data) ⇒ Object

Returns a StringIO



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# File 'lib/decidim/admin/import/readers/json.rb', line 38

def example_file(data)
  columns = data.shift
  json_data = data.map do |row|
    deep_hash(
      columns.each_with_index.to_h { |col, ind| [col, row[ind]] }
    )
  end

  ::StringIO.new(::JSON.pretty_generate(json_data))
end

#read_rows ⇒ Object 



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# File 'lib/decidim/admin/import/readers/json.rb', line 14

def read_rows
  json_string = File.read(file)
  columns = []
  data = ::JSON.parse(json_string)
  data.each_with_index do |row, index|
    row = flat_hash(row)
    if index.zero?
      columns = row.keys
      yield columns.map(&:to_s), index
    end

    values = columns.map { |c| row[c] }
    last_present = values.rindex { |v| !v.nil? }
    if last_present
      yield values[0..last_present], index + 1
    else
      yield [], index + 1
    end
  end
rescue ::JSON::ParserError
  raise Decidim::Admin::Import::InvalidFileError, "The provided JSON file is not valid"
end