Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/active_filtr.rb

Class Method Summary collapse

Class Method Details

.assoc_filter_to_sql(attr, filter, negation = false) ⇒ Object 



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# File 'lib/active_filtr.rb', line 135

def self.assoc_filter_to_sql(attr, filter, negation=false)
  if filter.respond_to?(:each)
    return self.value_combination_to_sql(attr, filter, :assoc)
  end
  negation = negation ? 'NOT ' : ''
  assoc = self.reflect_on_association(attr)
  if assoc.macro == :has_and_belongs_to_many
    number_filter = self.number_filter_to_sql(assoc.association_foreign_key, filter)
    values = number_filter[1..-1]
    sql = "id #{negation}IN (SELECT #{assoc.foreign_key} FROM #{assoc.join_table} WHERE #{number_filter.first})"
  end # todo: erweitern
  return [sql] + values
end

.boolean_filter_to_sql(attr, filter, negation = false) ⇒ Object 



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# File 'lib/active_filtr.rb', line 127

def self.boolean_filter_to_sql(attr, filter, negation=false)
  if filter.respond_to?(:each)
    return self.value_combination_to_sql(attr, filter, :boolean)
  end
  negation = negation ? 'NOT ' : ''
  return ["#{negation}#{attr} = ?", filter]
end

.date_filter_to_sql(attr, filter, negation = false) ⇒ Object 



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# File 'lib/active_filtr.rb', line 112

def self.date_filter_to_sql(attr, filter, negation=false)
  negation = negation ? 'NOT ' : ''
  if filter.respond_to?(:each)
    if filter.size != 2 # todo: value_combination einbauen
      raise "invalid date filter: #{filter.inspect} 2 elements expected, #{filter.size} given"
    end
    sql = "#{negation}#{attr} BETWEEN ? AND ?"
    values = filter
  else
    sql = "#{negation}#{attr} = ?"
    values = [filter]
  end
  return [sql] + values
end

.filter(filter) ⇒ Object

todo: auslagern in eigenes gem



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# File 'lib/active_filtr.rb', line 11

def self.filter(filter)
  relation = self
  # self.joins_for_filter(filter).each do |join_table|
  #   relation = relation.joins(join_table)
  # end
  return relation.where(*self.filter_to_sql(filter))
end

.filter_combination_to_sql(filter) ⇒ Object 



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# File 'lib/active_filtr.rb', line 38

def self.filter_combination_to_sql(filter)
  if [:and, :or].include? filter.first
    combination = filter.first
    filter = filter[1..-1]
  end
  combination ||= :or
  sqls = []
  values = []
  filter.each do |f|
    f = self.filter_to_sql(f)
    sqls << f.first
    values += f[1..-1]
  end
  sql = '(' + sqls.join(" #{combination.to_s.upcase} ") + ')'
  return [sql] + values
end

.filter_to_sql(filter) ⇒ Object 



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# File 'lib/active_filtr.rb', line 29

def self.filter_to_sql(filter)
  if filter.is_a? Hash # todo
    result = hash_filter_to_sql(filter)
  elsif filter.respond_to? :each
    result = filter_combination_to_sql(filter)
  end # todo: else
  return result
end

.hash_filter_to_sql(filter) ⇒ Object 



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# File 'lib/active_filtr.rb', line 55

def self.hash_filter_to_sql(filter)
  sqls = []
  values = []
  filter.each do |attr, filter|
    if self.reflect_on_association(attr)
      result = self.assoc_filter_to_sql(attr, filter)
    elsif column = self.columns_hash[attr.to_s]
      result = case column.type
      when :string
        self.string_filter_to_sql(attr, filter)
      when :integer, :decimal
        self.number_filter_to_sql(attr, filter)
      when :date
        self.date_filter_to_sql(attr, filter)
      when :boolean
        self.boolean_filter_to_sql(attr, filter)
      end
      # todo: erweitern
    else
      raise "Not possible to set a filter for #{attr}"
    end
    sqls << result.first
    values += result[1..-1]
  end
  sql = sqls.join(' AND ')
  return [sql] + values
end

.joins_for_filter(filter) ⇒ Object 



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# File 'lib/active_filtr.rb', line 19

def self.joins_for_filter(filter)
  join_tables = []
  filter.each do |attr, filter|
    if assoc = self.reflect_on_association(attr) and assoc.macro != :belongs_to
      join_tables << assoc.plural_name.to_sym # todo
    end
  end
  return join_tables.uniq
end

.number_filter_to_sql(attr, filter, negation = false) ⇒ Object 



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# File 'lib/active_filtr.rb', line 93

def self.number_filter_to_sql(attr, filter, negation=false)
  negation = negation ? 'NOT ' : ''
  if filter.respond_to?(:each)
    return self.value_combination_to_sql(attr, filter, :number)
  elsif filter.is_a? String
    unless result = filter.match(/^([!<>=]*)(\d+\.?\d*)$/)
      raise "invalid number filter: '#{filter}'"
    end
    connective = result[1].blank? ? '=' : result[1]
    value = result[2].include?('.') ? result[2].to_f : result[2].to_i
    sql = "#{negation}#{attr} #{connective} ?"
    values = [value]
  else
    sql = "#{negation}#{attr} = ?"
    values = [filter]
  end
  return [sql] + values
end

.string_filter_to_sql(attr, filter, negation = false) ⇒ Object 



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# File 'lib/active_filtr.rb', line 83

def self.string_filter_to_sql(attr, filter, negation=false)
  negation = negation ? 'NOT ' : ''
  if filter.respond_to?(:each)
    return self.value_combination_to_sql(attr, filter, :string)
  else
    sql = "#{negation}#{attr} = ?"
  end
  return [sql, filter]
end

.value_combination_to_sql(attr, filter, filter_type) ⇒ Object 



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# File 'lib/active_filtr.rb', line 149

def self.value_combination_to_sql(attr, filter, filter_type)
  # todo: check if set is possible
  if filter.first == :not
    return self.send("#{filter_type}_filter_to_sql", attr, filter[1], true)
  elsif [:and, :or].include? filter.first
    combination = filter.first
    filter = filter[1..-1]
  end
  combination ||= :or
  sqls = []
  values = []
  filter.each do |f|
    f = self.send("#{filter_type}_filter_to_sql", attr, f)
    sqls << f.first
    values += f[1..-1]
  end
  sql = '(' + sqls.join(" #{combination.to_s.upcase} ") + ')'
  return [sql] + values
end