Rails csv read with headers

I would like to import data from a CSV file into an existing database table. I do not want to save the CSV file, just take the data from it and put it into the existing table. Parse CSV file with header fields as attributes. How to read and access the CSV file?

In order to seed the database with the information from the CSV file, you will need to know the file path where your CSV file is located. To me it made the most sense to place by CSV file in the lib folder in my Rails API project directory. You may place your file where it makes most. Say you have CSV with header as a first row. And you have to parse this CSV.

I have always been seeing code which solve this problem but it’s not so convenient and reliable as I wanted. This method is intended as the primary interface for reading CSV files. You pass a path and any options you wish to set for the read.

Each row of file will be passed to the provided block in turn. This is really fantastic, but you can also. A CSV file is formatted with commas that act as the delimiters separating each data element. It is commonly used to store databases. A Guide to the Ruby CSV Library, Part I. This class provides a complete interface to CSV files and data.

It offers tools to enable you to read and write to and from Strings or IO objects, as needed. This post I will show how to read data from. It will also show how to seed a Rails database. Each row is yielded to the provided block which can alter it as needed. This library provides a complete interface to CSV files and data.

Ruby alternatives for parsing CSV files. It makes exporting records to csv a simple task, even when using responders. Considering that you have a model called User. First, Create a folder inside of lib called seeds.

In the example below, the file is called real_estate_transactions. Uncle Bob (if you’re confused who Uncle Bob is you might want to read Part of this tutorial) Uncle Bob is happy with the work we’ve done so far. I’m filing this one under “blog posts I wish existed when I was googling. If you are dealing with data on the web, you are probably most familiar with JSON and XML. Less common nowadays is CSV , but if it’s all you have, and the alternative is screen scraping, then you are thankful.

Importing from a CSV File Into Rails The bad way. For this example, imagine the CSV file has tens (or hundreds) of thousands of rows. The CSV text-file format is a common choice for both import and export when performing data migrations. What if you want to import CSV files within a Rails application? Let’s explore how to get sample data from an Excel CSV to render as a table on a skeleton rails application.

We’ll use activity tracker data to build a steps leaderboard for a fitness challenge. Learn how to export records into CSV files using Ruby on Rails. Steps: Add a controller and make sure you handle the csv request. Returns nil if headers will not be use true if they will but have not yet been read , or the actual headers after they have been read. Export Records to CSV Files using Rails - We’ll use this library to generate our CSV data.

I have a CSV file, which reads like this: read , book. I want to read only the first value, before comma one line at time, meaning first time it will be. The first line requires the Ruby CSV library we need to properly parse the CSV data. The next line reads in the CSV file into a variable. The last line prints the contents of the variable.

When you run rails slurp:transactions you should see a wall of text representing your CSV data.