Class: ActiveRecord::Base

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

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.assoc_filter_to_sql(attr, filter) ⇒ Object 



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# File 'lib/interview.rb', line 191

def self.assoc_filter_to_sql(attr, filter)
  assoc = self.reflect_on_association(attr)
  if assoc.macro == :belongs_to
    attr = "#{attr}_id"
  else
    attr = "#{assoc.plural_name}.id" # todo
  end
  return self.number_filter_to_sql(attr, filter)
end

.boolean_filter_to_sql(attr, filter) ⇒ Object 



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# File 'lib/interview.rb', line 187

def self.boolean_filter_to_sql(attr, filter)
  return ["#{attr} = ?", filter]
end

.date_filter_to_sql(attr, filter) ⇒ Object 



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# File 'lib/interview.rb', line 173

def self.date_filter_to_sql(attr, filter)
  if filter.respond_to?(:each)
    if filter.size != 2
      raise "invalid date filter: #{filter.inspect} 2 elements expected, #{filter.size} given"
    end
    sql = "#{attr} BETWEEN ? AND ?"
    values = filter
  else
    sql = "#{attr} = ?"
    values = [filter]
  end
  return [sql] + values
end

.filter(filter) ⇒ Object

todo: auslagern in eigenes gem



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# File 'lib/interview.rb', line 90

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_to_sql(filter) ⇒ Object 



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# File 'lib/interview.rb', line 108

def self.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

.human_ids ⇒ Object 



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# File 'lib/interview.rb', line 84

def self.human_ids
  objects = select("\"#{self.table_name}\".\"human_id\"").order(:human_id)
  return objects.map { |object| object.human_id }
end

.human_name(options = {}) ⇒ Object 



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# File 'lib/interview.rb', line 201

def self.human_name(options={})
  options = {scope: [self.i18n_scope, :models], count: 1}.merge(options)
  I18n.translate(self.name.underscore, options)
end

.joins_for_filter(filter) ⇒ Object 



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# File 'lib/interview.rb', line 98

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) ⇒ Object 



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# File 'lib/interview.rb', line 145

def self.number_filter_to_sql(attr, filter)
  if filter.respond_to?(:each) and filter.none? { |f| f.is_a? String }
    sql = "#{attr} in (?)"
    values = [filter]
  elsif filter.respond_to?(:each)
    sqls = []
    values = []
    filter.each do |f|
      result = self.number_filter_to_sql(attr, f)
      sqls << result.first
      values += results[1..-1]
    end
    sql = sqls.join(' OR ')
  elsif filter.is_a? String
    unless result = filter.match(/^([<>=]*)(\d+\.?\d*)$/)
      raise "invalid number filter: '#{filter}'"
    end
    operator = result[1] != '' ? result[1] : '='
    value = result[2].include?('.') ? result[2].to_f : result[2].to_i
    sql = "#{attr} #{operator} ?"
    values = [value]
  else
    sql = "#{attr} = ?"
    values = [filter]
  end
  return [sql] + values
end

.string_filter_to_sql(attr, filter) ⇒ Object 



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

def self.string_filter_to_sql(attr, filter)
  if filter.respond_to?(:each)
    sql = "#{attr} in (?)"
  else
    sql = "#{attr} = ?"
  end
  return [sql, filter]
end

Instance Method Details

#set_human_id ⇒ Object 



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# File 'lib/interview.rb', line 70

def set_human_id
  if respond_to? :human_id
    if respond_to? :name
      self.human_id = self.name.to_s
    elsif respond_to? :title
      self.human_id = self.title.to_s
    elsif respond_to? :description
      self.human_id = self.description.to_s
    else
      self.human_id = self.id.to_s
    end
  end
end