Generating PDFs From Webpages With A Large Number Of Graphs

When we generate survey reports for clients, along with online reports with interactive graphs we also generate PDFs that clients can print out and share. Converting our online reports-each of which sometimes has several hundred graphs spread across multiple pages-to PDFs has been an interesting challenge.

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What I’ve learned after half a year of working remote

Early last year my wife and I got the great news that she had been accepted for a research fellowship at the NIH in Bethesda, MD. Although very excited for the opportunity, that unfortunately meant that we had to move down there and leave Boston. At the time I had been working for Panorama for just a few months, but it was definitely enough time for me to get hooked with the company’s mission, its energy and above all my coworkers who I already called friends.

It has been over half a year now since I went remote, and with the new year I feel it’s time for a little retrospective.

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Ruby Gem – ExternalFields

ExternalFields

We recently released a rails gem called ExternalFields (Github). As the name suggests, this gem allows you to create the illusion that an object has specific attributes when those attributes actually belong to an associated object. This is particularly useful for different classes within a single-table inheritance table to have access to separate fields in class-specific associations. In addition, this gem gives us more power than standard Ruby/Rails built-in delegation methods by automatically creating necessary objects and associating them.

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How we added accessibility to our web app

We recently held our Fall Hackathon where all teams at Panorama take a 24-hour period to collaborate across the whole company to hack on great things. Many of our Hackathon projects are outside of our day-to-day work, would move Panorama’s efforts forward, or just solve that nagging problem that you just hadn’t gotten around to yet. For the four of us (1 engineer, 2 account managers, and 1 director) on Team A11y, we focused on the accessibility of our product.

Accessibility here refers to the design of products, devices, services, or environments for people with disabilities. Our products are used by students, families, and educators around the world, and we need to be able to serve every user as equally as we can. Fortunately, there are some initiatives in the tech world that provided us a lot of guidance and helped to shape our thoughts on how to approach this, in particular: the a11y project and W3C’s guidance on accessibility.

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A Homemade Distributed Computing Project

One of the things that gets me really excited is making the world a better place. As an engineer, I’m often in the mindset of automating as much as possible. But can we automate making the world a better place?

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Implementing priority lanes for jobs of the same type in Sidekiq

We use Sidekiq Pro to manage all background jobs in our Rails application. While Sidekiq has built-in support for prioritizing jobs of different types, the framework does not inherently support prioritization for jobs of the same type. So we built out that feature ourselves!

Our Sidekiq setup involves workers split into a few different worker types differentiated by memory availability and the concurrency with which jobs are processed. Initially, workers belonging to each worker type had a single designated queue they pulled jobs from. For example, consider two types of jobs, FancyJobA and FancyJobB that are both processed by the same type of worker type_a_worker.

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Toward a Swankier Rails Console

As Rails developers, we spend a fair amount of time in the Rails console, which is itself just the native Interactive Ruby Shell (IRB). By default, it’s not particularly pretty…

$ rails c
irb(main):001:0> def hello
irb(main):002:1> puts “hello”
irb(main):003:1> end
=> :hello
irb(main):004:0> hello
hello
=> nil
irb(main):005:0>

…but it gets the job done. We were content with it, because we didn’t know things could be better.

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A way to change a foreign key reference with zero downtime

In a project we recently completed, we had to refactor an object so that one of its foreign key associations referred to a new model. We use Ruby/Rails and deploy code to Heroku with Preboot enabled. Implementing this change safely without any downtime was surprisingly tricky to get right (in fact we didn’t at first, and ended up with a brief outage in a part of our product, although fortunately no data was lost). Pedro Belo’s post on hot compatibility lists some patterns to make basic data migrations zero-downtime deployment safe. As Belo mentions at the end of his post, hot compatibility needs to be addressed at the application level, and often takes a lot of planning and work. This article describes a reusable pattern to safely make a change to a foreign key reference with no downtime.

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Our Engineering Book Club

Every Wednesday afternoon you will find the engineers at Panorama huddled by the couches or gathered around the desks by the projector. Why? It’s Book Club time!

The Book Club started back in June 2014 when we realized that all of us had favorite programming/technical books which we loved talking about and wanted everyone else to read. So we decided that we’d all read a book together and then share our thoughts, learnings, questions. And then, every Wednesday, we discuss for half an hour what the chapter taught us, what we agree or disagree with and how can we incorporate the learnings in our daily work.

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Panorama Engineering Goes Civic Hacking!

At Panorama, one of our core company values is to contribute to the communities we are a part of and in the spirit of this value, one of the goals of the engineering team this quarter is to further this culture of giving back to the community. As part of this goal, we are undertaking initiatives to get involved with the thriving local developer community in Boston.

We identified CodeAcross Boston 2015, a civic tech hackathon organized by Code for Boston, as a cool local developer event to attend; David, Geoffrey and I represented Panorama at the weekend-long hackathon. Our goals for this event were twofold: first, get acquainted with other developers around Boston, and second, hack on a project that we believed could benefit the people of the city.

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