Ruby on Rails Question:
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What are filters? and how many types of filters are there in ruby?

Answer:

Filters enable controllers to run shared pre and post
processing code for its actions.

Filter methods are macro-style, that is, they appear at the
top of your controller method, inside the class context,
before method definitions.

the below types of filters in ruby

before_filter,
after_filter,
prepend_before_filter,
prepend_after_filter,
around_filter

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