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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 projection
projection = ::String == projection.class ?
Nodes::SqlLiteral.new(projection) :
projection
@ctx.projections << projection
self
end
def where expr
@ctx.wheres << expr
self
end
def wheres
Compatibility::Wheres.new @engine, @ctx.wheres
end
def take limit
@head.limit = limit
self
end
end
end
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