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@@ -23,25 +23,28 @@ class Setting < ActiveRecord::Base |
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validates_uniqueness_of :name |
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validates_inclusion_of :name, :in => @@available_settings.keys |
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validates_numericality_of :value, :only_integer => true, :if => Proc.new { |setting| @@available_settings[setting.name]['format'] == 'int' } |
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def self.get(name) |
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name = name.to_s |
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setting = find_by_name(name) |
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setting ||= new(:name => name, :value => @@available_settings[name]['default']) if @@available_settings.has_key? name |
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setting |
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end |
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# Hash used to cache setting values |
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@cached_settings = {} |
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@cached_cleared_on = Time.now |
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# Returns the value of the setting named name |
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def self.[](name) |
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get(name).value |
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value = @cached_settings[name] |
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value ? value : (@cached_settings[name] = find_or_default(name).value) |
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end |
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def self.[]=(name, value) |
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setting = get(name) |
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setting = find_or_default(name) |
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setting.value = (value ? value.to_s : "") |
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@cached_settings[name] = nil |
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setting.save |
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setting.value |
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end |
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# Defines getter and setter for each setting |
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# Then setting values can be read using: Setting.some_setting_name |
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# or set using Setting.some_setting_name = "some value" |
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@@available_settings.each do |name, params| |
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src = <<-END_SRC |
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def self.#{name} |
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@@ -58,4 +61,26 @@ class Setting < ActiveRecord::Base |
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END_SRC |
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class_eval src, __FILE__, __LINE__ |
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end |
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# Checks if settings have changed since the values were read |
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# and clears the cache hash if it's the case |
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# Called once per request |
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def self.check_cache |
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settings_updated_on = Setting.maximum(:updated_on) |
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if settings_updated_on && @cached_cleared_on <= settings_updated_on |
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@cached_settings.clear |
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@cached_cleared_on = Time.now |
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logger.info "Settings cache cleared." if logger |
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end |
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end |
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private |
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# Returns the Setting instance for the setting named name |
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# (record found in database or new record with default value) |
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def self.find_or_default(name) |
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name = name.to_s |
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raise "There's no setting named #{name}" unless @@available_settings.has_key?(name) |
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setting = find_by_name(name) |
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setting ||= new(:name => name, :value => @@available_settings[name]['default']) if @@available_settings.has_key? name |
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end |
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end |