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# ruby | |
res = params.require(:table).permit(:field1, | |
table_sub_table_attributes: [:key_field_id, :id, :_destroy]) | |
res[:table_sub_table_attributes] = reduce_params(res[:table_sub_table_attributes], :key_field_id) | |
# reduce delete to delete existing which is not selected | |
# and insert only when is not an existing | |
# does not handle updating existing (which is not used) | |
def reduce_params(attributes, key_field) | |
res = [] | |
retain = [] | |
attributes.each do |row| | |
# only append destroy if no new record found | |
if row[:_destroy] | |
# existing destroy | |
del = true | |
attributes.each do |inner_row| | |
if !inner_row[:_destroy] && row[key_field] == inner_row[key_field] | |
# found insert, means don't delete | |
del = false | |
break | |
end | |
end # inner loop | |
if !del | |
retain << row[key_field] # ignoring | |
else | |
res << row # append for deletion | |
end | |
elsif !row[:id] | |
# only append new record if not an existing | |
if !retain.include?(row[key_field]) | |
res << row | |
end | |
# insert or existing | |
end | |
end # outer loop | |
# Rails.logger.info "in: #{attributes.inspect}, \n result: #{res.inspect}" | |
res | |
end |
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