Module: Sakuramochi::Relation

Extended by:
ActiveSupport::Concern
Defined in:
lib/sakuramochi/relation.rb

Instance Method Summary collapse

Instance Method Details

#build_where_with_condition(opts, other = []) ⇒ Object 



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# File 'lib/sakuramochi/relation.rb', line 47

def build_where_with_condition(opts, other = [])
  if Sakuramochi::Condition.condition?(opts)
    ast = Sakuramochi::Condition::Parser.new(opts.dup).parse
    [collapse_conditions(ast, other)].compact
  else
    build_where_without_condition(opts, other)
  end
end

#collapse_conditions(node, other) ⇒ Object 



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# File 'lib/sakuramochi/relation.rb', line 13

def collapse_conditions(node, other)
  case node
  when Sakuramochi::Condition::Nodes::Expression
    case node.operator.to_s
    when 'and'
      left = collapse_conditions(node.left, other)
      right = collapse_conditions(node.right, other)
      left && right ? Arel::Nodes::And.new([left, right]) : left || right

    when 'or'
      left = collapse_conditions(node.left, other)
      right = collapse_conditions(node.right, other)
      left && right ? Arel::Nodes::Or.new(left, right) : left || right
    end

  when Sakuramochi::Condition::Nodes::Term
    case node.operator.to_s
    when 'not'
      right = collapse_conditions(node.value, other)
      Arel::Nodes::Not.new(right) if right
    end

  when Sakuramochi::Condition::Nodes::Factor
    wheres = build_where_without_condition(node.value, other)
    arel = table.from(table)
    collapse_wheres(arel, (wheres - ['']).uniq)
    arel.constraints.inject { |left, right| left.and(right) }

  when Sakuramochi::Condition::Nodes::Group
    expression = collapse_conditions(node.expression, other)
    Arel::Nodes::Grouping.new(expression) if expression
  end
end