What can I add to this method to force full gridlines in Excel export?
def export_invoices
headers['Content-Type'] = "application/vnd.ms-excel"
headers['Content-Disposition'] = 'attachment; filename="Invoices.xls"'
headers['Cache-Control'] = ''
#invoices = Invoice.all
render :layout => nil
end
Thanks!
Hmm, lots of things going on here that I don't think make sense. The line
#invoices = Invoice.all
results in SQL like SELECT "invoices".* FROM "invoices" -- the * means you want all columns from the table, and the .all means you want all the invoices, not just one. Unless the contents of the table is a single column binary type, I cannot see this working, since Excel's file format is vendor-specific binary (I think!).
Are you using some gem like paperclip or other to handle saving files? Unless you are manipulating the actual excel data from within Rails (perhaps with a gem that knows how to do this), either the file was saved with gridlines on, or not.
This page describes how you can format your Excel file using XML.
If I understand you question correctly, you are looking to style the output in excel. To do that you need to actually generate an office open XML document, not dump CSV with application headers.
Have a look at these two gems
http://rubygems.org/gems/axlsx
http://rubygems.org/gems/acts_as_xlsx
They should give you what you want.
Related
I need to create an Excel document in Ruby. My requirements are: multiple sheets, some basic formatting, ability to create hyperlinks between cells within the document and creating drop downs. I found two gems: axlsx and writeexcel which seem to offer almost everything that I want. The one mising thing is a default value for created drop downs. I ran the data validation examples for both gems and in both cases the cell containing the drop-down is empty until a human being chooses a value.
What I need is a default value displayed in the cell. So, if %w[ maybe, yes, no ] are the allowed values, then I want "maybe" to be displayed in the cell.
I read what seemed relevant parts of the documentation of both gems, but I didn't find any obvious way to say, that I want some value to be selected by default in the drop down.
I'm not emotionally attached to neither axlsx nor writeexcel, if you can suggest any other approach that will give me what I want, I'll be a happy camper.
OK, so I've found a solution to my question with writeexcel gem. I'm not sure if it's stupid or if it's obvious, but it works well enough for me. What I did is write my default value to a cell, and then add a drop down to the same cell. Below is code based on data_validate.rb example file:
#!/usr/bin/ruby -w
# -*- coding: utf-8 -*-
require 'writeexcel'
workbook = WriteExcel.new('default_dropdown.xls')
worksheet = workbook.add_worksheet
worksheet.set_column('A:A', 32)
txt = 'Select a value from a drop down list'
worksheet.write(1, 1, 'open')
worksheet.write(1, 0, txt)
worksheet.data_validation(1, 1,
{
:validate => 'list',
:source => ['open', 'high', 'close']
})
workbook.close
I have to read data from a spread sheet modify some rows and then write the updated rows / cells into the same file.
I have used Spreadsheet gem with Ruby 2.0.0.
When I write the results back to the same file, I am unable to open the xls any more. I get an error
"File Format is not Valid"
in MS Excel.
When the updates are written onto a different file, I am able to open the file but it is in protected view. Is there a solution to this issue?
Below is the sample code:
require 'rubygems'
require 'spreadsheet'
book = Spreadsheet::open('filePath')
sheet = book.worksheet 0
## have application logic in here
book.write('filePath')
I've worked with this problem a few times and they've had the issue on log for around a year now.
The first problem is that it locks the file when spreadsheet loads it and there is no clear way to close it the only way I've been able to get it to not lock is with this code block. It opens it and stores the first worksheet off into its own variable then closes the file.
worksheet = nil
Spreadsheet.open workbook_name do |inner_book|
worksheet = inner_book.worksheet 0
end
worksheet
If you want all the worksheets you could do something similar. In addition to the file opening closing/problem you have the issue around capturing the content of the worksheet depending on the format. I know for my purposes I end up doing the following to capture the content. This sadly loses any formatting you might have had in the source spreadsheet.
rows = []
worksheet.each do |row|
rows << row
end
You can then make your own workbook/sheet and iterate through the rows and add them to the new sheet/book. Then save the new book with the same file name.
Its not fun or efficient, but it is a way to go about solving the problem. Hope this helped.
check your file extension.
spreadsheet, writeexcel..etc gems seem couldn't work with xlsx files.
try .xls not .xlsx
I am learning Ruby and trying to manipulate Excel data.
my goal:
To be able to extract email addresses from an excel file and place them in a text file one per line and add a comma to the end.
my ideas:
i think my answer lies in the use of spreadsheet and File.new.
What I am looking for is direction. I would like to hear any tips or rather hints to accomplish my goal. thanks
Please do not post exact code only looking for direction would like to figure it out myself...
thanks, karen
UPDATE::
So, regex seems to be able to find all matching strings and store them into an array. I´m having some trouble setting that up but should be able to figure it out....but for right now to get started I will extract only the column labeled "E Mail"..... the question I have now is:
`parse_csv = CSV.parse(read_csv, :headers => true)`
The default value for :skip_blanks is set to false.. I need to set it to true but nowhere can I find the correct syntax for doing so... I was assumming something like
`parse_csv = CSV.parse(read_csv, :headers => true :skip_blanks => true)`
But no.....
save your excel file as csv (comma separated value) and work with Ruby's libraries
besides spreadsheet (which can read and write), you can read Excel and other file types with with RemoteTable.
gem install remote_table
and
require 'remote_table'
t = RemoteTable.new('/path/to/file.xlsx', headers: :first_row)
when you write the CSV, as #aug2uag says, you can use ruby's standard library (no gem install required):
require 'csv'
puts [name, email].to_csv
Personally, I'd keep it as simple as possible and use a CSV.
Here is some pseudocode of how that would work:
read in your file line by line
extract your fields using regex, or cell count (depending on how consistent the email address location is), and insert into an arry
iterate through the array and write the values in the fashion you wish (to console, or file)
The code in the comment you had is a great start, however, puts will only write to console, not file. You will also need to figure out how you are going to know you are getting the email address.
Hope this helps.
I have been looking for a way to read out an Excel spreadsheet with keeping the dates that are in them being kept as a string. Unfortunately I can't see if this is possible or not, has anyone managed to do this or know how?
You may want to have a look at the Row class of the spreadsheet gem:
http://spreadsheet.rubyforge.org/Spreadsheet/Row.html
There's a lot that you can get there, but the Row#formatted method is probably what you want:
row = sheet.to_a[row_index] # Get row object
value = row.formatted[column_index]
The formatted method takes all the Excel formatting data for you and gives you an array of Ruby-classed objects
I think you can try row.at(col_index) method..
You can refer to this page
I've been trying to work with getting a single column out of a csv file.
I've gone through the documentation, http://www.ruby-doc.org/stdlib/libdoc/csv/rdoc/index.html
but still don't really understand how to use it.
If I use CSV.table, the response is incredibly slow compared to CSV.read. I admit the dataset I'm loading is quite large, which is exactly the reason I only want to get a single column from it.
My request is simply currently looks like this
#dataTable = CSV.table('path_to_csv.csv')
and when I debug I get a response of
#<CSV::Table mode:col_or_row row_count:2104 >
The documentation says I should be able to use by_col(), but when I try to output
<%= debug #dataTable.by_col('col_name or index') %>
It gives me "undefined method 'col' error"
Can somebody explain to me how I'm supposed to use CSV? and if there is a way to get columns faster using 'read' instead of 'table'?
I'm using Ruby 1.92, which says that it is using fasterCSV, so I don't need to use the FasterCSV gem.
To pluck a column out of a csv I'd probably do something like the following:
col_data = []
CSV.foreach(FILENAME) {|row| col_data << row[COL_INDEX]}
That should be substantially faster than any operations on CSV.Table
You can get the values from single column of the csv files using the following snippet.
#dataTable = CSV.table('path_to_csv.csv')
#dataTable[:columnname]