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module ActiveRecord
class Relation
class WhereClause # :nodoc:
attr_reader :binds
delegate :any?, :empty?, to: :predicates
def initialize(predicates, binds)
@predicates = predicates
@binds = binds
end
def +(other)
WhereClause.new(
predicates + other.predicates,
binds + other.binds,
)
end
def merge(other)
WhereClause.new(
predicates_unreferenced_by(other) + other.predicates,
non_conflicting_binds(other) + other.binds,
)
end
def except(*columns)
WhereClause.new(*except_predicates_and_binds(columns))
end
def or(other)
if empty?
self
elsif other.empty?
other
else
WhereClause.new(
[ast.or(other.ast)],
binds + other.binds
)
end
end
def to_h(table_name = nil)
equalities = predicates.grep(Arel::Nodes::Equality)
if table_name
equalities = equalities.select do |node|
node.left.relation.name == table_name
end
end
binds = self.binds.map { |attr| [attr.name, attr.value] }.to_h
equalities.map { |node|
name = node.left.name
[name, binds.fetch(name.to_s) {
case node.right
when Array then node.right.map(&:val)
when Arel::Nodes::Casted, Arel::Nodes::Quoted
node.right.val
end
}]
}.to_h
end
def ast
Arel::Nodes::And.new(predicates_with_wrapped_sql_literals)
end
def ==(other)
other.is_a?(WhereClause) &&
predicates == other.predicates &&
binds == other.binds
end
def invert
WhereClause.new(inverted_predicates, binds)
end
def self.empty
@empty ||= new([], [])
end
# TODO Change this to private once we've dropped Ruby 2.2 support.
# Workaround for Ruby 2.2 "private attribute?" warning.
protected
attr_reader :predicates
def referenced_columns
@referenced_columns ||= begin
equality_nodes = predicates.select { |n| equality_node?(n) }
Set.new(equality_nodes, &:left)
end
end
private
def predicates_unreferenced_by(other)
predicates.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 { |attr| conflicts.include?(attr.name) }
end
def inverted_predicates
predicates.map { |node| invert_predicate(node) }
end
def invert_predicate(node)
case node
when NilClass
raise ArgumentError, "Invalid argument for .where.not(), got nil."
when Arel::Nodes::In
Arel::Nodes::NotIn.new(node.left, node.right)
when Arel::Nodes::Equality
Arel::Nodes::NotEqual.new(node.left, node.right)
when String
Arel::Nodes::Not.new(Arel::Nodes::SqlLiteral.new(node))
else
Arel::Nodes::Not.new(node)
end
end
def except_predicates_and_binds(columns)
except_binds = []
binds_index = 0
predicates = self.predicates.reject do |node|
except = \
case node
when Arel::Nodes::Between, Arel::Nodes::In, Arel::Nodes::NotIn, Arel::Nodes::Equality, Arel::Nodes::NotEqual, Arel::Nodes::LessThan, Arel::Nodes::LessThanOrEqual, Arel::Nodes::GreaterThan, Arel::Nodes::GreaterThanOrEqual
binds_contains = node.grep(Arel::Nodes::BindParam).size
subrelation = (node.left.kind_of?(Arel::Attributes::Attribute) ? node.left : node.right)
columns.include?(subrelation.name.to_s)
end
if except && binds_contains > 0
(binds_index...(binds_index + binds_contains)).each do |i|
except_binds[i] = true
end
end
binds_index += binds_contains if binds_contains
except
end
binds = self.binds.reject.with_index do |_, i|
except_binds[i]
end
[predicates, binds]
end
def predicates_with_wrapped_sql_literals
non_empty_predicates.map do |node|
if Arel::Nodes::Equality === node
node
else
wrap_sql_literal(node)
end
end
end
ARRAY_WITH_EMPTY_STRING = [""]
def non_empty_predicates
predicates - ARRAY_WITH_EMPTY_STRING
end
def wrap_sql_literal(node)
if ::String === node
node = Arel.sql(node)
end
Arel::Nodes::Grouping.new(node)
end
end
end
end
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