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    <p>You could store your selection rule in a Hash and reuse the hash:</p> <pre><code>require 'sequel' DB = Sequel.sqlite selection = { a: 1, b: 2 } ds1 = DB[:x].where( selection ) selection[:a] = 5 #change data ds2a = ds1.unfiltered.filter(selection) # change selection ds2b = DB[:x].where( selection ) #Alternative usage puts ds1.sql #SELECT * FROM `x` WHERE ((`a` = 1) AND (`b` = 2)) puts ds2a.sql #SELECT * FROM `x` WHERE ((`a` = 5) AND (`b` = 2)) puts ds2b.sql #SELECT * FROM `x` WHERE ((`a` = 5) AND (`b` = 2)) </code></pre> <hr> <p>I found a possibility to modify a dataset with the new methods <code>filter_exchange</code> and <code>filter_exchange!</code>.</p> <pre><code>require 'sequel' DB = Sequel.sqlite module Sequel class Dataset def filter_exchange!( filter ) filter.each{|key, value| opts[:where].args.each{|arg| if arg.args.first == key arg.args.pop arg.args &lt;&lt; value end } } self end def filter_exchange( filter ) sel = self.unfiltered filter.each{|key, value| opts[:where].args.each{|arg| if arg.args.first == key sel = sel.filter(key =&gt; value) else sel = sel.filter(arg) end } } sel end end end ds1 = DB[:x].filter(a:1, b:2) puts ds1.sql #SELECT * FROM `x` WHERE ((`a` = 1) AND (`b` = 2)) puts ds1.filter_exchange( a: 7).sql #SELECT * FROM `x` WHERE ((`a` = 7) AND (`b` = 2) puts ds1.sql #SELECT * FROM `x` WHERE ((`a` = 1) AND (`b` = 2) puts ds1.filter_exchange!( a: 7).sql#SELECT * FROM `x` WHERE ((`a` = 7) AND (`b` = 2) puts ds1.sql #SELECT * FROM `x` WHERE ((`a` = 7) AND (`b` = 2) </code></pre> <p><code>filter_exchange!</code> modifies your original dataset command! Even a <code>ds.dup.filter_exchange!</code> will change your original selection.</p> <p>With <code>filter_exchange</code> you get a modified dataset. (Not very well tested up to now).</p>
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