Map Your World and Ona at Geo for Good 2015


Ona Collect

This past October I spoke on behalf of Map Your World at the 2015 Geo for Good User Summit.

Map Your World empowers youth to explore issues and ideas that matter - like clean drinking water, or food justice – then write surveys, collect data, and create maps to make change in their communities. This amazing project is powered by the Ona API.

Below is a video of the talk I gave, which includes a clip from the film The Revolutionary Optimists.

Clojure Destructuring Gotcha!


Given the following function definition, what would you expect to happen if you ran (hello :person nil)?

(defn hello
      [& {:keys [person]
          :or {person "Rich"}}]
      (str "Hello, " person))

(hello) => "Hello, Rich"
(hello :person "Hickey") => "Hello, Hickey"
(hello :person nil) => "Hello, "

I’d have expected (hello :person nil) to have the same result as calling (hello), but as it turns out, Clojure seems to make a distinction between nothing and nil when it comes to destructuring.

A real world situation where this might occur would be where you, for instance, rely on the result of a destructuring operation to provide parameters for a function similar to hello. e.g.

(defn spam
      [& {:keys [person]}]
      (str (hello :person person)
            "Give me all your money."))

Calling (spam) would result in (hello :person nil) being called, which would have the - probably - unintended effect of returning "Hello, ". You may choose to add an :or when destructuring the argument to spam, but then you’ll have the same code appearing twice. A more localised solution would be changing the hello definition to be something like this.

(defn hello
      [& {:keys [person]}]
      (str "Hello, " (or person "Rich")))

This worked for my case, but I’d love to hear about more idiomatic approaches.

A New Client for Smartphones: Ona Collect


Ona Collect

Today we are announcing the launch of Ona Collect, a tweaked version of ODK Collect created especially for Ona users. This new mobile client is a baby step into building a seamless experience for our users, starting with a few small improvements.

 Continue reading A New Client for Smartphones: Ona Collect...

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  • The Ona Team

The Ona unlimited free trial is ending tomorrow!


The 3 week free trial for Ona is ending tomorrow and we’ll be enabling usage limits for users who have not signed up for a paid plan.

Starting tomorrow, users with personal accounts that are not on a paid plan will be transitioned to the free Community plan. This plan has a limit of 500 submissions total to private forms per month, 15 private forms, and 1 private project. Public project and forms, and submissions to public forms are unlimited.

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