In a model, before uploading an .xls file, I want to be able to validate excel files before they are saved by the application. I am trying to open the to-be-saved excel file from the :file_url object(column in comits table where the .xls files will be saved) and then validate it but I am getting a no implicit conversion of Symbol into String error.
The validation works when I place the actual file path of an excel file that has been uploaded and saved by carrierwave into Roo::Excel.new("") but that defeats the purpose of my validation.
How can I grab the excel file without it being stored in the application?
I appreciate the help! I hope is not too confusing.
This is my comit.rb
class Comit < ActiveRecord::Base
belongs_to :user
mount_uploader :file_url, ComitUploader, mount_on: :file_url
validates :filename, :file_url, presence: true
validates_format_of :file_url, with: /.xls/, message: "Wrong file format"
before_save :validate_excel
def validate_excel
sheet = Roo::Excel.new(:file_url)
errors = []
header = sheet.row(1)
num_of_columns = sheet.last_column
errors << 'Need headers' unless
errors << 'Need more columns' if num_of_columns < 21
errors
end
end
You're passing the symbol :file_url to Roo::Excel.new, it wants a path to the file. Try:
sheet = Roo::Excel.new(file_url)