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module Arel
class SelectManager < Arel::TreeManager
include Arel::Crud
def initialize engine
super
@head = Nodes::SelectStatement.new
@ctx = @head.cores.last
end
def on expr
@ctx.froms.last.constraint = Nodes::On.new(expr)
self
end
def from table
@ctx.froms << table
self
end
def project *projections
@ctx.projections.concat projections
self
end
def where expr
@ctx.wheres << expr
self
end
def order *expr
@head.orders.concat expr
self
end
def wheres
Compatibility::Wheres.new @engine, @ctx.wheres
end
def take limit
@head.limit = limit
self
end
def join_sql
viz = Visitors::JoinSql.new @engine
Nodes::SqlLiteral.new viz.accept @ctx
end
def joins manager
manager.join_sql
end
def to_a
raise NotImplementedError
end
end
end
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