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Contents
require 'active_support/concern'
require 'sakuramochi/condition'
module Sakuramochi
module Relation
extend ActiveSupport::Concern
included do
alias :build_where_without_condition :build_where
alias :build_where :build_where_with_condition
end
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
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
end
end
Version data entries
6 entries across 6 versions & 1 rubygems