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# coding: utf-8
class SimpleExporter < SimpleInterface
def export opts={}
configuration.validate!
init_env opts
@csv = nil
fail_with_error "Unable to write in file: #{self.filepath}" do
dir = Pathname.new(self.filepath).dirname
FileUtils.mkdir_p dir
@csv = CSV.open(self.filepath, 'w', self.configuration.csv_options)
end
self.configuration.before_actions(:parsing).each do |action| action.call self end
@statuses = ""
if ENV["NO_TRANSACTION"]
process_collection
else
ActiveRecord::Base.transaction do
process_collection
end
end
self.status ||= :success
rescue SimpleInterface::FailedOperation
self.status = :failed
ensure
@csv&.close
task_finished
end
def collection
@collection ||= begin
coll = configuration.collection
coll = coll.call() if coll.is_a?(Proc)
coll
end
end
def encode_string s
s.encode("utf-8").force_encoding("utf-8")
end
protected
def init_env opts
@number_of_lines = collection.size
super opts
end
def process_collection
self.configuration.before_actions(:all).each do |action| action.call self end
log "Starting export ..."
log "Export will be written in #{filepath}"
@csv << self.configuration.columns.map(&:name)
if collection.is_a?(ActiveRecord::Relation) && collection.model.column_names.include?("id")
ids = collection.pluck :id
ids.in_groups_of(configuration.batch_size).each do |batch_ids|
collection.where(id: batch_ids).each do |item|
handle_item item
end
end
else
collection.each{|item| handle_item item }
end
print_state
end
def map_item_to_rows item
return [item] unless configuration.item_to_rows_mapping
configuration.item_to_rows_mapping.call(item).map {|row| row.is_a?(ActiveRecord::Base) ? row : CustomRow.new(row) }
end
def resolve_value item, col
scoped_item = col.scope.inject(item){|tmp, scope| tmp.send(scope)}
val = col[:value]
if val.nil? || val.is_a?(Proc)
if val.is_a?(Proc)
val = instance_exec(scoped_item, &val)
else
attributes = [col.attribute].flatten
val = attributes.inject(scoped_item){|tmp, attr| tmp.send(attr) if tmp }
end
end
if val.nil? && !col.omit_nil?
push_in_journal({event: :attribute_not_found, message: "Value missing for: #{[col.scope, col.attribute].flatten.join('.')}", kind: :warning})
self.status ||= :success_with_warnings
@new_status ||= colorize("✓", :orange)
end
if val.nil? && col.required?
@new_status = colorize("x", :red)
raise "MISSING VALUE FOR COLUMN #{col.name}"
end
val = encode_string(val) if val.is_a?(String)
val
end
def handle_item item
number_of_lines = @number_of_lines
@current_item = item
map_item_to_rows(item).each_with_index do |item, i|
@number_of_lines = number_of_lines + i
@current_row = item.attributes
@current_row = @current_row.slice(*configuration.logged_attributes) if configuration.logged_attributes.present?
row = []
@new_status = nil
self.configuration.columns.each do |col|
val = resolve_value item, col
@new_status ||= colorize("✓", :green)
row << val
end
push_in_journal({event: :success, kind: :log})
@statuses += @new_status
print_state if @current_line % 20 == 0 || i > 0
@current_line += 1
@csv << row
end
end
class CustomRow < OpenStruct
def initialize data
super data
@data = data
end
def attributes
flatten_hash @data
end
protected
def flatten_hash h
h.each_with_object({}) do |(k, v), h|
if v.is_a? Hash
flatten_hash(v).map do |h_k, h_v|
h["#{k}.#{h_k}".to_sym] = h_v
end
else
h[k] = v
end
end
end
end
class Configuration < SimpleInterface::Configuration
attr_accessor :collection
attr_accessor :batch_size
attr_accessor :logged_attributes
attr_accessor :item_to_rows_mapping
def initialize import_name, opts={}
super import_name, opts
@collection = opts[:collection]
@batch_size = opts[:batch_size] || 1000
@logged_attributes = opts[:logged_attributes]
@item_to_rows_mapping = opts[:item_to_rows_mapping]
end
def options
super.update({
collection: collection,
batch_size: batch_size,
logged_attributes: logged_attributes,
item_to_rows_mapping: item_to_rows_mapping,
})
end
def map_item_to_rows &block
@item_to_rows_mapping = block
end
def add_column name, opts={}
raise "Column already defined: #{name}" if @columns.any?{|c| c.name == name.to_s}
super name, opts
end
def validate!
raise "Incomplete configuration, missing collection for #{@import_name}" if collection.nil?
end
end
end
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