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module Feature
module Repository
# AcitveRecordRepository for active feature list
# Right now we assume you have at least name:string and active:boolean
# defined in your table.
#
# Example usage:
# repository = ActiveRecordRepository.new(FeatureToggle)
# repository.add_active_feature(:feature_name)
# # use repository with Feature
#
class ActiveRecordRepository
# Constructor
#
def initialize(model)
@model = model
end
# Returns list of active features
#
# @return [Array<Symbol>] list of active features
#
def active_features
@model.where(active: true).map { |f| f.name.to_sym }
end
# Add an active feature to repository
#
# @param [Symbol] feature the feature to be added
#
def add_active_feature(feature)
check_feature_is_not_symbol(feature)
check_feature_already_in_list(feature)
@model.create!(name: feature.to_s, active: true)
end
# Checks if the given feature is a not symbol and raises an exception if so
#
# @param [Sybmol] feature the feature to be checked
#
def check_feature_is_not_symbol(feature)
raise ArgumentError, "#{feature} is not a symbol" unless feature.instance_of?(Symbol)
end
private :check_feature_is_not_symbol
# Checks if given feature is already added to list of active features
# and raises an exception if so
#
# @param [Symbol] feature the feature to be checked
#
def check_feature_already_in_list(feature)
raise ArgumentError, "feature :#{feature} already added" if @model.exists?(name: feature.to_s)
end
private :check_feature_already_in_list
end
end
end
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