Ruby Read Csv File With Headers

October 09 2015 4 minute read.

Ruby read csv file with headers.

Each row and the comma separated strings within each row can be thought of as a single record in a database. Ruby on rails import data from a csv file 8 i would like to import data from a csv file into an existing database table. Working with csv files in ruby. When importing data i often find it useful to validate the headers of the imported csv to ensure that valid columns are provided.

Ruby provides csv support in the standard library and it will help us do most of the job very quickly. Csv is an important file type for data base management and ruby makes it easy for programmers to work with csv files. Although there are various ways to achieve the same results we will be focusing in just 2 of the possible ways read the file entirely with the read method or line by line with the foreach method. But suppose we want to skip the header and iterate over the remaining rows of csv file.

Csv stands for comma separated values and csv files contain rows of text. I do not want to save the csv file just take the data from it and put it into the existing table. Each row has strings separated by commas. This method wraps a string you provide or an empty default string in a csv object which is passed to the provided block.

Id name 1 chocolate 2 bacon 3 apple 4 banana 5 almonds now you re going to learn how to use the ruby csv library to read write csv files. Read csv file without header. Ruby on rails rails ruby read csv with headers. Csv ruby 2 6 1.

Let s see how to do that. Call dup before passing if you need a new string. In the previous example we iterated through all the rows of csv file including header. You can use the block to append csv rows to the string and when the block exits the final string will be returned.

You can read a file directly. Ruby can be easily connected to the databases such as oracle sybase db2 and mysql. Some users may provide columns in different cases to what you expect or with different punctuation including spaces etc. Today in this intermediate level tutorial we look at different ways to process and manipulate csv files.

Note that a passed string is modified by this method. Ruby comes with a built in csv library. Require csv csv read favorite foods csv or you can parse a string with csv.