Allow queries to be chained on has_many associations

[paulsturgess]

Calling the has_many relation on a class returns an instance of RelationArray.

I've updated RelationArray so it responds to where(*args) to allow additional queries to be chained onto the association.

Hopefully the test demonstrates this clearly.

[DougPuchalski]

Hmm, not sure about this one. So you've already dereferenced a scope into an array, and you're going back to the relation to extend the scope? I would think you would want to use the original relation before you dereferenced (i.e. to_a) on it. Or, can you explain the use case?

[paulsturgess]

Sure, the use case really comes from a common idiom in Ruby on Rails for querying the database.

It is possible to chain additional scopes together. So like in my test, I would do things like:

class Team
  # ...
  has_many :team_members
end

@the_a_team.team_members.where(:can_fly => true).order(:name)

In MotionModel there is an inconsistency in what is returned when a class is queried:

Company.where(:name => 'foo')
  => MotionModel::SQLScope

Company.employees
  => MotionModel::CollectionRelation::RelationArray

Maybe the answer is make changes so that both return MotionModel::SQLScope

[DougPuchalski]

.where should most definitely return a scope, that's the bug.