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36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
# Use Tap For Better Test Data Setup
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I often use RSpec's `let` statement to set up some test data.
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```ruby
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let(:order) { create(:order, name: "My Order") }
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```
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Often times, realistic test data requires setting up peripheral data as well.
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```ruby
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let(:order) do
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order = create(:order, name: "My Order")
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create(:item, name: "Burger", order: order, price: 4.99)
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create(:item, name: "Fries", order: order, price: 2.99)
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order
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end
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```
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This can get hard to read as the subject of the `let` gets obscured. It is also
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clumsy that we have to end with returning the `order`. This can be cleaned up
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with the use of [`#tap`](https://devdocs.io/ruby~2.5/object#method-i-tap).
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```ruby
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let(:order) do
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create(:order, name: "My Order").tap do |order|
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create(:item, name: "Burger", order: order, price: 4.99)
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create(:item, name: "Fries", order: order, price: 2.99)
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end
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end
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```
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The block notation and indentation make it clear that the `order` is what is
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getting created. Meanwhile, the interior of the block gives us a designated
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area to do what we need to with the newly-created `order` instance.
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