Read csv file in rails

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You may provide a second Encoding to have the data transcoded as it is read. This method wraps a String you provide, or an empty default String, in a CSV object which is passed to the provided block. You can use the block to append CSV rows to the String and when the block exits, the final String will be returned.

Note that a passed String is modified by this method. Call dup before passing if you need a new String. This method understands an additional :encoding parameter when not passed a String to set the base Encoding for the output. This method understands an additional :encoding parameter to set the base Encoding for the output.

This method will try to guess your Encoding from the first non- nil field in row , if possible, but you may need to use this parameter as a backup plan. If a block is given, the instance is passed to the block and the return value becomes the return value of the block. See CSV::open for a complete list. If you pass a String for data , you can later retrieve it after writing to it, for example with CSV.

Note that a wrapped String will be positioned at the beginning for reading. If you want it at the end for writing , use CSV::generate. If you want any other positioning, pass a preset StringIO object instead. Available options are:. The String placed between each field.

This String will be transcoded into the data's Encoding before parsing. The String appended to the end of each row. This can be set to the special :auto setting, which requests that CSV automatically discover this from the data.

A sequence will be selected even if it occurs in a quoted field, assuming that you would have the same line endings there. Obviously, discovery takes a little time. Set manually if speed is important.

Also note that IO objects should be opened in binary mode on Windows if this feature will be used as the line-ending translation can cause problems with resetting the document position to where it was before the read ahead.

The character used to quote fields. This has to be a single character String. This is useful for application that incorrectly use ' as the quote character instead of the correct ". CSV will always consider a double sequence of this character to be an escaped quote. This is a maximum size CSV will read ahead looking for the closing quote for a field. In truth, it reads to the first line ending beyond this size. You can use this limit to prevent what are effectively DoS attacks on the parser.

However, this limit can cause a legitimate parse to fail and thus is set to nil , or off, by default. A single converter doesn't have to be in an Array.

All built-in converters try to transcode fields to UTF-8 before converting. The conversion will fail if the data cannot be transcoded, leaving the field unchanged. Note that :headers supplied by Array or String were not fields of the document and thus will have an empty Array attached. If set to an Array, the contents will be used as the headers.

When false , header rows are silently swallowed. If set to true , header rows are returned in a CSV::Row object with identical headers and fields save that the fields do not go through the converters. When true and :headers is set, a header row will be added to the output. Identical in functionality to :converters save that the conversions are only made to header rows.

All built-in converters try to transcode headers to UTF-8 before converting. The conversion will fail if the data cannot be transcoded, leaving the header unchanged. When set to a true value, CSV will skip over any empty rows. Note that this setting will not skip rows that contain column separators, even if the rows contain no actual data.

When set to an object responding to match , every line matching it is considered a comment and ignored during parsing. When set to a String, it is first converted to a Regexp. When set to nil no line is considered a comment. If the passed object does not respond to match , ArgumentError is thrown. When set to a true value, CSV will attempt to parse input not conformant with RFC , such as double quotes in unquoted fields.

Options cannot be overridden in the instance methods for performance reasons, so be sure to set what you want here. This is intended as the primary interface for writing a CSV file. You must pass a filename and may optionally add a mode for Ruby's open.

You may also pass an optional Hash containing any options CSV::new understands as the final argument. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Create a free website or blog at WordPress. Ruby on Rails. Home About. Share this: Twitter Facebook. Like this: Like Loading Leave a Reply Enter your comment here Fill in your details below or click an icon to log in:.

Email required Address never made public. Name required. Follow Following. You should be able to run rake db:seed at the end of each step. The new line converts the CSV file into a structure that Ruby can read. This new addition loops through the entire CSV file and converts each row of the document into a hash. Sorry, something went wrong. Cheers for this. Can I allow a user to import his data into my app? I am working on Contact management app and I want to let a new user import all his contacts into the app.

A user could import his contacts from csv using the same method but the code would not be in the seeds file. Helped me a lot! Of course! Has anyone been able to make this work with devise. It says users saved but on rails console after running Users. Thank you, this has helped me so much! Way easier and simpler than trying to use a gem. I don't know why all other seeding rails with a csv tutorials are so weak, but your's is significantly better.

Thank you for posting this! Incredibly helpful, thanks! Really helpful! I don't know how to get upper value's Id. Hi, i have tried this and my data saves but i can't find it anywhere! I am a newbie to rails and coding in general but I have to assume the data goes somewhere if it says "saved". ANy help would be greatly appreciated. Everything works as it should until the last step, I get only null values. It says x amount of records have been created, but they just show up as blank records. There are no errors even when running rake db:seed --trace.

That's all.