I need a Ruby on Rails developer to occasionnally help out by writing code snippets

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Vasiliy M.Deepak V.Thanh C.Jack W.Daniel M. + 5 others have already sent a proposal.
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Experience Level: Intermediate
General information for the business: I develop a RoR app for recruitment agencies
Num. of modules: 1
Description of every module: This is an example of the kind of module required, please let me know how long it would take for you to address this issue:

I have one array which contains the master data, e.g.:

[1, 3, 7, 11]

and a database with a table which contains arrays with various numbers, e.g:

1) [1, 5, 7, 11]
2) [2, 3, 4, 8, 10]
3) [1, 3, 7, 11, 15]

I am looking for an easy way to calculate which ones of the arrays are the closest one to the master data and rank it accordingly. The result would be that

No 3 - 100% of master data has a matching number in it
No 1 - 75%
No 2 - 25%
Description of requirements/functionality: I am currently developing a RoR app but for efficiency's sake I will need from time to time code snippets either as rails helpers or methods to address a specific issue; this might be easily solvable with an existing gem or function of ruby and I would expect to be advised on that (happy to pay for that information as well).
The code needs to be well documented and rspec tests need to be provided as part of the work.
Specific technologies required: ruby on rails
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