问题
I have a spreadsheet of members
designed as below:
My aim is to upload some columns and exclude others. In this case, I wish to upload only the name
, age
and email
and exclude the others. I have been able to achieve this using the slice
method as shown below:
def load_imported_members
spreadsheet = open_spreadsheet
spreadsheet.default_sheet = 'Worksheet'
header = spreadsheet.row(1)
(2..spreadsheet.last_row).map do |i|
row = Hash[[header, spreadsheet.row(i)].transpose]
member = Member.find_by_id(row["id"]) || Member.new
member.attributes = row.to_hash.slice("id", "name", "age", "email")
member
end
end
The problem is that last_row
considers all the rows upto the last one (13), and since there are validations on the form, there are errors due to missing data as a result of the empty rows (which shouldn’t be considered). Is there a way I can upload only specific columns as I have done, yet limit to only the rows that have data?
回答1:
You might want to chain the map
call off of a reject
filter like this example
You may just need to change the map
line to this (assuming the missing rows all look like those above):
(2..spreadsheet.last_row).reject{|i| spreadsheet.row(i)[0] }.map do |i|
This is assuming the blank rows return as nil and that blank rows will always have all four desired fields blank as shown in the image. The reject
call tests to see if spreadsheet.row(i)[0]
, the id column, is nil, if so the item is rejected from the list output given to map
回答2:
Thanks for this question. I have learned some things from this question.
I have shortlisted your answer [note: use 'ROO' gem]
def load_imported_members(member)
spreadsheet = open_spreadsheet(member)
spreadsheet.each do |records|
record = @spreadsheet ? Hash[[@header, @spreadsheet.row(records)].transpose] : Hash[records] # transpose for xlsx records and
attributes = {id: record['id'], name: record['name'], email: record['email'], age: record['age']}
member_object = Member.new(attributes)
if member_object.valid?
if Member.find(attributes[:id])
Member.find(attributes[:id]).update(attributes)
else
member_object.save
end
end
end
end
You can parse your uploaded file using Roo gem.
def self.open_spreadsheet(member)
case File.extname(member.file.original_filename)
when ".csv" then
Roo::CSV.new(member.file.expiring_url, csv_options: {headers: true, skip_blanks: true, header_converters: ->(header) { header.strip }, converters: ->(data) { data ? data.strip : nil }})
when ".xlsx", ".xls" then
@spreadsheet = Roo::Spreadsheet.open(member.file.expiring_url)
@header = @spreadsheet.row(1)
(2..@spreadsheet.last_row)
end
end
Here I have used s3 uploaded url i.e expiring_url. Hope This will helpful. I have not tested. sorry, for small errors.
If you have used validations for name, email, and age. This will surely help u..
来源:https://stackoverflow.com/questions/58517282/how-to-omit-empty-rows-using-last-row-in-roo-rails