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How can I iterate through an array of Activerecord::Relation objects? For instance, let's say I have a Comment class and a User class and I'd like to get all the comment contents from 3 specific users (assuming comments belong to users and user_id is the foreign key): 

>> @males = Comment.where('user_id IN (?)', ["123","456","789"])
=> [...] #Array of comment Activerecord::Relation objects

Now I'd like to iterate through comments_from_males and collect all the content attribute contents for each comment in the array.

To clarify, the following works but only for the first male returned, but I need all the comments for all males:

>> @males.first.comments.map(&:content)
=> ["first comment", "second comment"]
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3 Answers 3

Reset to default
7 
comments = @males.map {|user| user.comments.map(&:content)}.flatten
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1 
Comment.where('user_id IN (?)', ["123","456","789"]).pluck(:content)

The method pluck

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2 Comments

Activerecord::relation objects don't have a pluck method available to them.
Example from documentation - Person.where(:confirmed => true).limit(5).pluck(:id)
1

You can use

comments_from_males = @males.collect{|e| e.content if e.gender == "male"}.flatten

It will give you list of all comments from males. Check my db assumptions match.

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