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Rubygem
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Description: Advanced seed data handling for Rails, combining the best practices of several methods together.
Homepage: http://mbleigh.lighthouseapp.com/projects/10223-seed-fu
Clone URL: git://github.com/mbleigh/seed-fu.git 
Optionally do not overwrite seed data if it already exists. In many cases 
production servers will update data and be authoritative; therefore overwriting 
in these cases isn't what you want.

To not overwrite and just insert if not existing, use: Content.seed(:data_key, 
true) do |s|...end
darcy (author)
Mon Jul 07 15:19:59 -0700 2008
commit  a1c40c9a38dae136b76565c36c7049327f46e797
tree    d171940f87fe57172881d1f7990301240d405953
parent  93e54062cec39aad5249c4dbcc35bcaa8efcf633
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lib/seeder.rb 
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@@ -2,9 +2,11 @@ class Seeder
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   def self.plant(model_class, *constraints, &block)
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     constraints = [:id] if constraints.empty?
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     seed = Seeder.new(model_class)
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+    insert_only = constraints.last.is_a? TrueClass
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+    constraints.delete_at(*constraints.length-1) if (constraints.last.is_a? TrueClass or constraints.last.is_a? FalseClass)
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     seed.set_constraints(*constraints)
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     yield seed
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-    seed.plant!
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+    seed.plant!(insert_only)
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   end
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   def initialize(model_class)
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@@ -26,8 +28,9 @@ class Seeder
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     @data[name.to_sym] = value
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   end
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-  def plant!
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+  def plant! insert_only=false
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     record = get
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+    return if !record.new_record? and insert_only
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     @data.each do |k, v|
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       record.send("#{k}=", v)
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     end

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