Module: FlagShihTzu::ClassMethods

Defined in:
lib/flag_shih_tzu.rb

Instance Method Summary collapse

Instance Method Details

#chained_flags_condition(colmn = DEFAULT_COLUMN_NAME, *args) ⇒ Object 



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# File 'lib/flag_shih_tzu.rb', line 301

def chained_flags_condition(colmn = DEFAULT_COLUMN_NAME, *args)
  %[(#{flag_full_column_name(table_name, colmn)} in (#{chained_flags_values(colmn, *args).join(",")}))]
end

#chained_flags_with(column = DEFAULT_COLUMN_NAME, *args) ⇒ Object 



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# File 'lib/flag_shih_tzu.rb', line 293

def chained_flags_with(column = DEFAULT_COLUMN_NAME, *args)
  if (ActiveRecord::VERSION::MAJOR >= 3)
    where(chained_flags_condition(column, *args))
  else
    all(conditions: chained_flags_condition(column, *args))
  end
end

#check_flag(flag, colmn) ⇒ Object 



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# File 'lib/flag_shih_tzu.rb', line 265

def check_flag(flag, colmn)
  unless colmn.is_a?(String)
    raise ArgumentError,
          %[Column name "#{colmn}" for flag "#{flag}" is not a string]
  end
  if flag_mapping[colmn].nil? || !flag_mapping[colmn].include?(flag)
    raise ArgumentError,
          %[Invalid flag "#{flag}"]
  end
end

#determine_flag_colmn_for(flag) ⇒ Object

Raises:



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# File 'lib/flag_shih_tzu.rb', line 283

def determine_flag_colmn_for(flag)
  return DEFAULT_COLUMN_NAME if flag_mapping.nil?
  flag_mapping.each_pair do |colmn, mapping|
    return colmn if mapping.include?(flag)
  end
  raise NoSuchFlagException.new(
    %[determine_flag_colmn_for: Couldn't determine column for your flags!]
  )
end

#flag_keys(colmn = DEFAULT_COLUMN_NAME) ⇒ Object 



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# File 'lib/flag_shih_tzu.rb', line 305

def flag_keys(colmn = DEFAULT_COLUMN_NAME)
  flag_mapping[colmn].keys
end

#has_flags(*args) ⇒ Object 



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# File 'lib/flag_shih_tzu.rb', line 24

def has_flags(*args)
  if ActiveRecord::VERSION::STRING >= "4.1."
    begin
      connection
    rescue ActiveRecord::NoDatabaseError
      return
    end
  end

  flag_hash, opts = parse_flag_options(*args)
  opts =
    {
      named_scopes: true,
      column: DEFAULT_COLUMN_NAME,
      flag_query_mode: :in_list, # or :bit_operator
      strict: false,
      check_for_column: true
    }.update(opts)
  if !valid_flag_column_name?(opts[:column])
    warn %[FlagShihTzu says: Please use a String to designate column names! I see you here: #{caller.first}]
    opts[:column] = opts[:column].to_s
  end
  colmn = opts[:column]
  if opts[:check_for_column] && (active_record_class? && !check_flag_column(colmn))
    warn(
      %[FlagShihTzu says: Flag column #{colmn} appears to be missing!
To turn off this warning set check_for_column: false in has_flags definition here: #{caller.first}]
    )
    return
  end

  # options are stored in a class level hash and apply per-column
  self.flag_options ||= {}
  flag_options[colmn] = opts

  # the mappings are stored in this class level hash and apply per-column
  self.flag_mapping ||= {}
  # If we already have an instance of the same column in the flag_mapping,
  #   then there is a double definition on a column
  if opts[:strict] && !self.flag_mapping[colmn].nil?
    raise DuplicateFlagColumnException
  end
  flag_mapping[colmn] ||= {}

  # keep track of which flag columns are defined on this class
  self.flag_columns ||= []
  self.flag_columns << colmn

  flag_hash.each do |flag_key, flag_name|
    unless valid_flag_key?(flag_key)
      raise ArgumentError,
            %[has_flags: flag keys should be positive integers, and #{flag_key} is not]
    end
    unless valid_flag_name?(flag_name)
      raise ArgumentError,
            %[has_flags: flag names should be symbols, and #{flag_name} is not]
    end
    # next if method already defined by flag_shih_tzu
    next if flag_mapping[colmn][flag_name] & (1 << (flag_key - 1))
    if method_defined?(flag_name)
      raise ArgumentError,
            %[has_flags: flag name #{flag_name} already defined, please choose different name]
    end

    flag_mapping[colmn][flag_name] = 1 << (flag_key - 1)

    class_eval "      def \#{flag_name}\n        flag_enabled?(:\#{flag_name}, \"\#{colmn}\")\n      end\n      alias :\#{flag_name}? :\#{flag_name}\n\n      def \#{flag_name}=(value)\n        FlagShihTzu::TRUE_VALUES.include?(value) ?\n          enable_flag(:\#{flag_name}, \"\#{colmn}\") :\n          disable_flag(:\#{flag_name}, \"\#{colmn}\")\n      end\n\n      def not_\#{flag_name}\n        !\#{flag_name}\n      end\n      alias :not_\#{flag_name}? :not_\#{flag_name}\n\n      def not_\#{flag_name}=(value)\n        FlagShihTzu::TRUE_VALUES.include?(value) ?\n          disable_flag(:\#{flag_name}, \"\#{colmn}\") :\n          enable_flag(:\#{flag_name}, \"\#{colmn}\")\n      end\n\n      def \#{flag_name}_changed?\n        if colmn_changes = changes[\"\#{colmn}\"]\n          flag_bit = self.class.flag_mapping[\"\#{colmn}\"][:\#{flag_name}]\n          (colmn_changes[0] & flag_bit) != (colmn_changes[1] & flag_bit)\n        else\n          false\n        end\n      end\n\n    EVAL\n\n    if active_record_class?\n      class_eval <<-EVAL, __FILE__, __LINE__ + 1\n        def self.\#{flag_name}_condition(options = {})\n          sql_condition_for_flag(\n            :\#{flag_name},\n            \"\#{colmn}\",\n            true,\n            options[:table_alias] || table_name\n          )\n        end\n\n        def self.not_\#{flag_name}_condition\n          sql_condition_for_flag(:\#{flag_name}, \"\#{colmn}\", false)\n        end\n\n        def self.set_\#{flag_name}_sql\n          sql_set_for_flag(:\#{flag_name}, \"\#{colmn}\", true)\n        end\n\n        def self.unset_\#{flag_name}_sql\n          sql_set_for_flag(:\#{flag_name}, \"\#{colmn}\", false)\n        end\n\n        def self.\#{colmn.singularize}_values_for(*flag_names)\n          values = []\n          flag_names.each do |flag_name|\n            if respond_to?(flag_name)\n              values_for_flag = send(:sql_in_for_flag, flag_name, \"\#{colmn}\")\n              values = if values.present?\n                values & values_for_flag\n              else\n                values_for_flag\n              end\n            end\n          end\n\n          values.sort\n        end\n      EVAL\n\n      # Define the named scopes if the user wants them and AR supports it\n      if flag_options[colmn][:named_scopes]\n        if ActiveRecord::VERSION::MAJOR == 2 && respond_to?(:named_scope)\n          class_eval <<-EVAL, __FILE__, __LINE__ + 1\n            named_scope :\#{flag_name}, lambda {\n              { conditions: \#{flag_name}_condition }\n            }\n            named_scope :not_\#{flag_name}, lambda {\n              { conditions: not_\#{flag_name}_condition }\n            }\n          EVAL\n        elsif respond_to?(:scope)\n          # Prevent deprecation notices on Rails 3\n          #   when using +named_scope+ instead of +scope+.\n          # Prevent deprecation notices on Rails 4\n          #   when using +conditions+ instead of +where+.\n          class_eval <<-EVAL, __FILE__, __LINE__ + 1\n            scope :\#{flag_name}, lambda {\n              where(\#{flag_name}_condition)\n            }\n            scope :not_\#{flag_name}, lambda {\n              where(not_\#{flag_name}_condition)\n            }\n          EVAL\n        end\n      end\n\n      if method_defined?(:saved_changes)\n        class_eval <<-EVAL, __FILE__, __LINE__ + 1\n          def saved_change_to_\#{flag_name}?\n            if colmn_changes = saved_changes[\"\#{colmn}\"]\n              flag_bit = self.class.flag_mapping[\"\#{colmn}\"][:\#{flag_name}]\n              (colmn_changes[0] & flag_bit) != (colmn_changes[1] & flag_bit)\n            else\n              false\n            end\n          end\n        EVAL\n      end\n    end\n\n    if colmn != DEFAULT_COLUMN_NAME\n      class_eval <<-EVAL, __FILE__, __LINE__ + 1\n\n        def all_\#{colmn}\n          all_flags(\"\#{colmn}\")\n        end\n\n        def selected_\#{colmn}\n          selected_flags(\"\#{colmn}\")\n        end\n\n        def select_all_\#{colmn}\n          select_all_flags(\"\#{colmn}\")\n        end\n\n        def unselect_all_\#{colmn}\n          unselect_all_flags(\"\#{colmn}\")\n        end\n\n        # useful for a form builder\n        def selected_\#{colmn}=(chosen_flags)\n          unselect_all_flags(\"\#{colmn}\")\n          return if chosen_flags.nil?\n          chosen_flags.each do |selected_flag|\n            enable_flag(selected_flag.to_sym, \"\#{colmn}\") if selected_flag.present?\n          end\n        end\n\n        def has_\#{colmn.singularize}?\n          not selected_\#{colmn}.empty?\n        end\n\n        def chained_\#{colmn}_with_signature(*args)\n          chained_flags_with_signature(\"\#{colmn}\", *args)\n        end\n\n        def as_\#{colmn.singularize}_collection(*args)\n          as_flag_collection(\"\#{colmn}\", *args)\n        end\n\n      EVAL\n    end\n\n    # Define bang methods when requested\n    if flag_options[colmn][:bang_methods]\n      class_eval <<-EVAL, __FILE__, __LINE__ + 1\n        def \#{flag_name}!\n          enable_flag(:\#{flag_name}, \"\#{colmn}\")\n        end\n\n        def not_\#{flag_name}!\n          disable_flag(:\#{flag_name}, \"\#{colmn}\")\n        end\n      EVAL\n    end\n\n  end\n\nend\n", __FILE__, __LINE__ + 1

#set_flag_sql(flag, value, colmn = nil, custom_table_name = table_name) ⇒ Object

Returns SQL statement to enable/disable flag. Automatically determines the correct column.



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# File 'lib/flag_shih_tzu.rb', line 278

def set_flag_sql(flag, value, colmn = nil, custom_table_name = table_name)
  colmn = determine_flag_colmn_for(flag) if colmn.nil?
  sql_set_for_flag(flag, colmn, value, custom_table_name)
end