Andrew Hacking

Ok my bad, I got a bundler error using the current gems at rubygems.org so I assumed it was an issue with the dependencies and I just fixed it a...

Thanks Jose, just to clarify my use case is not date based but simply a sliding window of n rows. The actual problem I have is to calculate on a...

Sounds great to me!

I had a much closer look further at the semantics in dplyr and I don't believe _lead_ and _lag_ offer what is required. It is basically some macros around Series.shift()...

Something to consider, is dplyr also permits per operation grouping using the by(selection)_ argument which is applied and scoped just for the operation. [Ref](https://dplyr.tidyverse.org/reference/dplyr_by.html): _Grouping radically affects the computation of...

Yes good point, I believe that why dplyr uses the dot ".by" to distinguish the parameter from columns. I don't think that approach is all that clean as it would...

I think that could work, intersting approach! Would it be possible to also apply to a keyword list piping into the group by? ```elixir mutate([a: 7, b: a * 2]...

I have a number of use cases in my project. For example, I have different kinds of contacts (Person and Organisation). Person gets further refined as does Organisation. As such...

Hmm well the kitchen sink approach that @dwickern suggests is not very pretty and requires a lot of ugly and fragile conditional logic in the validation rules. Is there no...

I got very close to what I wanted using the following model mixin, but no cigar: ``` App.PolymorphicModel = Em.Mixin.create mixinFromData: (data) -> App[data.type] # TODO use injection voodoo once...