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Don't use this:
scope :red, where(color: 'red')
default_scope where(color: 'red')
Use this:
scope :red, -> { where(color: 'red') }
default_scope { where(color: 'red') }
The former has numerous issues. It is a common newbie gotcha to do
the following:
scope :recent, where(published_at: Time.now - 2.weeks)
Or a more subtle variant:
scope :recent, -> { where(published_at: Time.now - 2.weeks) }
scope :recent_red, recent.where(color: 'red')
Eager scopes are also very complex to implement within Active
Record, and there are still bugs. For example, the following does
not do what you expect:
scope :remove_conditions, except(:where)
where(...).remove_conditions # => still has conditions
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destoyed without catching the ActiveRecord::StaleObjectError.
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HasManyAssociation#inverse_updates_counter_cache?. Fixes #2755, where a counter cache could be decremented twice as far as it was supposed to be.
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association conditions on singular associations. Fixes #481 (again).
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be assigned without mass-assignment protection when a record is built on the association.
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macro multiple times that will give deprecation warnings, and in 3.2 we will simply overwrite the default scope when you call the macro multiple times.
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favour of defining a 'default_scope' class method in the model. See the CHANGELOG for more details.
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while declaring default_scope
Also added test for unscoped using block style with four different
combinations
Signed-off-by: José Valim <jose.valim@gmail.com>
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order that is declared first has highest priority in all cases.
Here are some examples.
Car.order('name desc').find(:first, :order => 'id').name
Car.named_scope_with_order.named_scope_with_another_order
Car.order('id DESC').scoping do
Car.find(:first, :order => 'id asc')
end
No special treatment to with_scope or scoping.
Also note that if default_scope declares an order then the order
declared in default_scope has the highest priority unless
with_exclusive_scope is used.
Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>
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child should be respected.
author.posts.create should take into account default_scope
defined on post.
[#3939: state:resolved]
Signed-off-by: José Valim <jose.valim@gmail.com>
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Signed-off-by: José Valim <jose.valim@gmail.com>
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belongs_to
[#4984 state:resolved]
Signed-off-by: José Valim <jose.valim@gmail.com>
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