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module ActiveRecord
class Relation
class WhereClause # :nodoc:
attr_reader :parts, :binds
def initialize(parts, binds)
@parts = parts
@binds = binds
end
def +(other)
WhereClause.new(
parts + other.parts,
binds + other.binds,
)
end
def merge(other)
WhereClause.new(
parts_unreferenced_by(other) + other.parts,
non_conflicting_binds(other) + other.binds,
)
end
def ==(other)
other.is_a?(WhereClause) &&
parts == other.parts &&
binds == other.binds
end
def self.empty
new([], [])
end
protected
def referenced_columns
@referenced_columns ||= begin
equality_nodes = parts.select { |n| equality_node?(n) }
Set.new(equality_nodes, &:left)
end
end
private
def parts_unreferenced_by(other)
parts.reject do |n|
equality_node?(n) && other.referenced_columns.include?(n.left)
end
end
def equality_node?(node)
node.respond_to?(:operator) && node.operator == :==
end
def non_conflicting_binds(other)
conflicts = referenced_columns & other.referenced_columns
conflicts.map! { |node| node.name.to_s }
binds.reject { |col, _| conflicts.include?(col.name) }
end
end
end
end
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