Class: SqlFilter

Inherits:
Object
  • Object
show all
Includes:
SqlFilterAttributes
Defined in:
lib/sql_filter.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from SqlFilterAttributes

included

Constructor Details

#initialize(vars = nil) ⇒ SqlFilter

Returns a new instance of SqlFilter.



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# File 'lib/sql_filter.rb', line 121

def initialize(vars=nil)
  # set default values
  for attr,options in self.class.attributes
    instance_variable_set '@'+attr.to_s, options[:default] 
  end
  
  if vars
    # send input values to setter methods
    for key,val in vars
      send "#{key}=", val 
    end
  end
end

Class Method Details

.attribute(*args) ⇒ Object 



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# File 'lib/sql_filter.rb', line 31

def self.attribute(*args)
  options   = args.delete_at(args.size-1) if args.last.is_a?(Hash)
  options ||= {}
  
  #puts "#############################"
  #puts self
  #puts "#############################"
  
  for attr in args
    
    
    class_method_lines = []
    
    options[:escape]       ||= true
    options[:ignore_blank] ||= true
    
    value    = options[:value]
    operator = options[:operator] || "="
    
    if operator.is_a?(Array)
      attr_accessor "operator_for_#{attr}"
      class_method_lines << "def operator_for_#{attr}"
      class_method_lines << "  options = self.class.attributes[:#{attr}]"
      class_method_lines << "  @operator_for_#{attr} ||= options[:default_operator]"
      if options[:ignore_blank]
        class_method_lines << "  return nil if @operator_for_#{attr}.to_s.empty?"
      end
      class_method_lines << "  raise 'unknown operator '+@operator_for_#{attr}+' for #{attr}' unless options[:operator].include?(@operator_for_#{attr})"
      class_method_lines << "  @operator_for_#{attr}"
      class_method_lines << "end"
      
    else
      class_method_lines << "def operator_for_#{attr}"
      class_method_lines << "  '#{operator.to_s.upcase}'"
      class_method_lines << "end"
    end
    
    class_method_lines << "def #{attr}_to_sql"
    class_method_lines << "return nil unless operator_for_#{attr}"
    
    # wenn kein statischer Wert vorgegeben ist
    unless options[:value].is_a?(String)
      attr_accessor attr
      # leere Werte bei Wunsch ignorieren
      if options[:ignore_blank]
        class_method_lines << "return nil if @#{attr}.to_s.empty?"
      end
    end
    
    
    right_sql = nil
    if value
      if value.is_a?(Array)
        # eingabe überprüfen
        class_method_lines << "raise 'xxx' unless self.class.attributes[:#{attr}][:value].include?(#{attr})"
        right_sql = attr.to_s
      else
        # vorgabe einsetzen
        right_sql = value.inspect
      end
    else
      if operator==:like
        right_sql = "'%'+#{attr}+'%'"
      else
        # nur methode aufrufen
        right_sql = attr.to_s
      end
    end
    
    field = options[:field] ? options[:field]  : attr
    field = field.to_s.split(".").collect{|c| "`"+c+"`"}.join "."
    if options[:escape] == false
      class_method_lines << "  '#{field} ' + operator_for_#{attr} + " + right_sql
    else
      class_method_lines << "  ['#{field} ' + operator_for_#{attr} + ' ?', " + right_sql + ']'
    end
    
    class_method_lines << "end"
    
    @attributes[attr] = options
    
    
    #puts class_method_lines.join "\n"
    class_eval class_method_lines.join "\n"

    operator = options[:operators]
    
  end
end

Instance Method Details

#to_a ⇒ Object

Build the whole conditions array



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# File 'lib/sql_filter.rb', line 136

def to_a
  sql = ["1"]
  
  for key, options in self.class.attributes
    val = instance_variable_get("@#{key}") || options[:default]
    res = send "#{key}_to_sql"
    if res.is_a?(Array)
      sql[0] << " AND (#{res.shift})"
      sql = sql + res
    elsif res # nicht nil
      sql[0] << " AND (#{res})"
    end
  end
  
  sql
end