[RAILS] Fixed 03-expert.rb set tracer only in dev env #621
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The variable `tracer` is only defined in Rails development env, so we only can set them in that env.
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thanks @timoschilling ! |
estolfo
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Oct 17, 2018
The variable `tracer` is only defined in Rails development env, so we only can set them in that env.
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The variable
traceris only defined in Rails development env, so we only can set them in that env.