Eager load relationships for questions, answers and users

[raccube]

No description provided.

[codecov]

Codecov Report

Merging #250 (817c221) into master (5552f04) will increase coverage by 2.57%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
+ Coverage   62.32%   64.90%   +2.57%     
==========================================
  Files          92       92              
  Lines        2121     2117       -4     
==========================================
+ Hits         1322     1374      +52     
+ Misses        799      743      -56     

Impacted Files	Coverage Δ
app/controllers/discover_controller.rb	0.00% <0.00%> (ø)
app/models/user/answer_methods.rb	100.00% <ø> (+20.00%)	⬆️
app/controllers/answer_controller.rb	86.66% <100.00%> (+86.66%)	⬆️
app/controllers/user_controller.rb	73.60% <100.00%> (+27.99%)	⬆️
app/models/user/relationship_methods.rb	100.00% <100.00%> (+25.00%)	⬆️
app/models/user/timeline_methods.rb	100.00% <100.00%> (ø)
app/models/user/question_methods.rb	100.00% <0.00%> (+20.00%)	⬆️

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