How to Integrate spree and jirafe? [closed] - ruby

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I tried alot of ways to install(integrate) my spree with jirafe on my localhost but all failed can anyone explain me the step by step process to integrate jirafe with spree

Do not use Jirafe's Ruby Client where #radar can't even submit a PR. Try using Jirafe's Ruby which has 20x less commits (63 for jirafe-ruby-client and 3 for jirafe-ruby).
Jirafe's support for ruby may be slightly concerning, therefore, I would recommend using Google Analytics.
You can read in more detail here my accidental rant on Jirafe and why you may want to use Google Analytics. I'm pretty sure Spree Analytics is a wrapper for the GA, but I may be wrong on that.

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How to make a database with Heroku [closed]

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Does anybody know how you can create a database using the Heroku hosting platform?
I have looked at so much tutorials but none of them seem to work...
I've tried MysQL, PsQl...
You should add the Heroku addon for the Database type you want to create. Then follow the doc for linking it with your app. Also con access the database externally with the settings that can found in Heroku Vars in your app. You also should provide more detailed information in your question, regarding your app.

Functional web chat [closed]

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I want to build a website with a chat. The chat should have a calling option,stickers,smiley faces.Which language would you suggest and why?
I`m thinking about ruby on rails or node.js
I am also thinking to find someone who maybe have experience in the
area, but i am not sure what kind of developer would suit me best.
Language choice depends on how many hours you want to spend on development and further support.
Node.js is a simple and fast option if you want to build a working prototype. If you want to build something with a future advance (in order to solve such issues as scalability) and you have more time you can look at Golang and similar languages.

Stripe API on Xamarin.Forms [closed]

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Has anyone here tried integrating the Stripe API on Xamarin.Forms? I've been looking through the internet and I can't find any resources about it. I just started training on Xamarin and I don't know much.
It would be very nice if someone could me with this problem. Thank you!
Simply put the Stripe API will work exactly like on any other platform, with the use of Microsoft.Net.Http and making calls to the rest service.
They are components as well, which are free that you can use.
https://components.xamarin.com/view/stripe
The component is no longer available. Look through this guide to make direct calls to the API. https://xamarinhelp.com/stripe-in-xamarin/

Understanding DataTorrent with example [closed]

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I am supposed to work on DataTorrent and looking for articles/documentation to go through. I could not find detailed documentation on what are operators, how are they used for processing our data and about MALHAR library which is being used in operators (not sure about this part). Can somebody help me in understanding about DataTorrent by suggesting references for it?
There are new links for the docs
DataTorrent
http://docs.datatorrent.com/
Apache Apex
http://apex.incubator.apache.org/docs.html
The following mailing lists are available for Apex:
dev#apex.incubator.apache.org is for people who want to contribute code to Apex.
users#apex.incubator.apache.org is a discussion forum for people who want to build apps and/or solutions using Apex
Malhar Operator Developer guide: https://www.datatorrent.com/docs/guides/OperatorDeveloperGuide.html
If you want to develop a connector, under the’ io’ package on github, you will see a bunch of our existing connectors that you might be able to re-purpose.: https://github.com/DataTorrent/Malhar/tree/master/library/src/main/java/com/datatorrent/lib/io
if you have any questions about our Malhar library and developing a connector, please send an email to our email group: malhar-users#googlegroups.com

Upgrading to Rails 4 from Rails 3 gotchas [closed]

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We have an app in Rails 3.2 that we want to upgrade to Rails 4.0. I have read the various guidelines available on the possible issues like here and here.
I would like to know of some not so common/obvious gotchas that we should be aware of when upgrading to 4.0?
Ones that got me:
CanCan not yet playing nicely with StrongParameters: Ended up using this work-around.
Named Scopes require Procs: Well documented, but still got me. See my issue here.
Turbolinks bypasses document.ready: Good overview here.

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