ruby on rails - Query ActiveRecord with file permission type mathematical formula -

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so standard file permissions written in 0 7:

7 = 4+2+1 (read/write/execute) 6 = 4+2 (read/write) 5 = 4+1 (read/execute) 4 = 4 (read) 3 = 2+1 (write/execute) 2 = 2 (write) 1 = 1 (execute)

so lets want save permissions on record same way. how place query/scope on records permit "read" permissions.

for example 4 == :record_permission % (4+1) should return readable permission records.


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