Module: Backframe::ActsAsAPI::Page

Defined in:
lib/backframe/actioncontroller/acts_as_api/page.rb

Constant Summary collapse

DEFAULT_PAGE = 
1
DEFAULT_PER_PAGE = 
100

Instance Method Summary collapse

Instance Method Details

#collection_to_array(collection, serializer, fields) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 90

def collection_to_array(collection, serializer, fields)
  rows = []
  cols = []
  row = []
  fields.each do |key|
    row << key
  end
  rows << row
  collection.all.each do |record|
    row = []
    serialized = serializer.new(record).attributes
    fields.each_with_index do |fullkey, col|
      value = serialized
      fullkey.to_s.split(".").each do |key|
        key = key.to_sym
        if value.is_a?(Hash) && value.key?(key)
          value = value[key]
        else
          value = nil
        end
      end
      if value.is_a?(Time)
        value = value.strftime("%F %T")
      elsif value.is_a?(Date)
        value = value.strftime("%F")
      elsif value.is_a?(TrueClass)
        value = 'true'
      elsif value.is_a?(FalseClass)
        value = 'false'
      elsif value.is_a?(NilClass)
        value = ''
      end
      row << "#{value}"
    end
    rows << row
  end
  rows
end

#collection_to_csv(collection, serializer, fields, separator) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 129

def collection_to_csv(collection, serializer, fields, separator)
  output = []
  rows = collection_to_array(collection, serializer, fields)
  rows.each do |row|
    output << row.join(separator)
  end
  output.join("\n")
end

#collection_to_xls(collection, serializer, fields) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 138

def collection_to_xls(collection, serializer, fields)
  filename = SecureRandom.hex(32).to_s.upcase[0,16]
  workbook = WriteXLSX.new(filename)
  worksheet = workbook.add_worksheet
  rows = collection_to_array(collection, serializer, fields)
  rows.each_with_index do |row, i|
    row.each_with_index do |col, j|
      worksheet.write(i, j, col)
    end
  end
  workbook.close
  data = open(filename).read
  File.unlink(filename)
  data
end

#expand_fields(collection, serializer, fields) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 68

def expand_fields(collection, serializer, fields)
  if fields.present?
    fields.split(',').map(&:to_s)
  else
    serialized = serializer.new(collection.first).attributes
    flatten_hash_keys(serialized)
  end
end

#flatten_hash_keys(hash, prefix = '') ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 77

def flatten_hash_keys(hash, prefix = '')
  keys = []
  hash.each do |key, value|
    fullkey =  (!prefix.empty?) ? "#{prefix}.#{key}" : key
    if value.is_a?(Hash)
      keys.concat(flatten_hash_keys(value, fullkey))
    else
      keys << fullkey.to_s
    end
  end
  keys
end

#page(collection, serializer = nil) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 7

def page(collection, serializer = nil)
  classname = collection.base_class.name+'Serializer'
  serializer ||= classname.constantize
  args = params.except(*request.path_parameters.keys)
  filters = args.except([:sort,:page,:per_page,:fields,:exclude_ids])
  model = (collection.respond_to?(:klass)) ? collection.klass.name.constantize : collection
  collection = model.filter(collection, filters) if collection.respond_to?(:filter)

  if args.key?(:sort)
    args[:sort].split(',').each do |sort|
      key = (sort[0] == '-') ? sort[1..-1] : sort
      order = (sort[0] == '-') ? 'desc' : 'asc'
      collection = model.sort(collection, key, order)
    end
  else
    collection = model.sort(collection)
  end

  if args.key?(:exclude_ids)
    ids = args[:exclude_ids].split(',')
    collection = collection.where('id NOT IN (?)', ids)
  end

  if args.key?(:all)
    args[:page] = 1
    args[:per_page] = 10000
  end

  args[:page] ||= DEFAULT_PAGE
  args[:per_page] ||= DEFAULT_PER_PAGE

  collection = (params[:format] == 'json') ? collection.page(args[:page]).per(args[:per_page]) : collection.all

  respond_to do |format|
    format.json {
      fields = (args.key?(:fields)) ? args[:fields].split(',').map(&:to_sym) : serializer._attributes
      render json: collection,
             each_serializer: serializer,
             content_type: 'application/json',
             adapter: Backframe::ActsAsAPI::Adapter,
             fields: fields,
             links: pagination_links(collection, args[:per_page], args[:page]),
             status: 200
    }
    format.csv {
      fields = expand_fields(collection, serializer,  args[:fields])
      content_type = (args.key?(:download) && args[:download] == 'false') ? 'text/plain' : 'text/csv'
      render :text => collection_to_csv(collection, serializer, fields, ","), :content_type => content_type, :status => 200
    }
    format.tsv {
      fields = expand_fields(collection, serializer,  args[:fields])
      content_type = (args.key?(:download) && args[:download] == 'false') ? 'text/plain' : 'text/tab-separated-values'
      render :text => collection_to_csv(collection, serializer, fields, "\t"), :content_type => content_type, :status => 200
    }
    format.xlsx {
      fields = expand_fields(collection, serializer,  args[:fields])
      render :text => collection_to_xls(collection, serializer, fields), :content_type => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', :status => 200
    }
  end
end

#pagination_link(per_page, page) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 173

def pagination_link(per_page, page)
  args = (per_page.to_i != DEFAULT_PER_PAGE) ? "per_page="+per_page.to_s+"&page="+page.to_s : "page="+page.to_s
  base_api_url+request.path+"?"+args
end

#pagination_links(collection, per_page, page) ⇒ Object 



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# File 'lib/backframe/actioncontroller/acts_as_api/page.rb', line 154

def pagination_links(collection, per_page, page)
  return {} if collection.total_count.zero?
  links = {}
  links[:self] = pagination_link(per_page, page)
  if collection.next_page.present?
    links[:next] = pagination_link(per_page, collection.next_page)
  end
  if page.to_i < collection.total_pages
    links[:last] = pagination_link(per_page, collection.total_pages)
  end
  if page.to_i > 1
    links[:first] = pagination_link(per_page, 1)
  end
  if collection.prev_page.present?
    links[:prev] = pagination_link(per_page, collection.prev_page)
  end
  links
end