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Ruby on Rails Part-III
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There is a bug in this code. The logout message is not appearing on the login template. What is the cause?
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1 point
The string assigned to flash[:notice] will not be available until the next browser request.
An instance variable should be used for flash[:notice]
This is an invalid syntax to use to assign valuse to flash[:notice]
The previous value of flash[:notice] will not be cleared automatically
Which statement about ActiveRecord models is true?
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1 point
Each database column requres adding a matching attr_accessor declaration in the ActiveRecord model.
All attributes in an ActiveRecord model are read-only declared as writable using attr_accessible
An instance of an ActiveRecord model will have attributes that match the columns in a corresponding database table.
ActiveRecord models can have only attributes that have a matching database column
What is the correct way to assign a value to the session?
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1 point
A
B
C
D
Which choice best describes the expected value of @result?
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1 point
either true or false
an unsaved Tag instance
a saved Tag instance
an array of Tag instances
What is the correct syntax for inserting a dynamic title tag into the header of your page from within an ERB view template?
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1 point
A
B
C
D
How would you validate that a project's name is not blank, is fewer than 50 characters, and is unique?
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1 point
A
B
C
D
If a product has a user-uploadable photo, which ActiveStorage method should fill in the blank?
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1 point
has_one_attached
has_image
attached_file
acts_as_attachment
If the only route defined is resources :products, what is an example of a URL that could be generated by this link_to method?
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1 point
A
B
C
D
Which part of the Rails framework is primarily responsible for making decisions about how to respond to a browser request?
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1 point
view
controller
ActiveRecord
model
If User is an ActiveRecord class, which choice would be expected to return an array?
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1 point
User.where(last_name: 'Smith')
User.find_or_create(last_name: 'Smith')
User.find_by_last_name('Smith')
User.find('Smith')
Which choice is not a valid Rails route?
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1 point
route "products/index", to: "products/index", via: :get
match "products/index", to: "products#index", via: :get
root "products/index"
get "products/index"
Given a table of blog_posts and a related table of comments (comments made on each blog post), which ActiveRecord query will retrieve all blog posts with comments created during @range?
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1 point
BlogPost.joins (:comments).where(comments: {created_at: @range})
BlogPost.where(['comments.created_at', @range])
BlogPost.preload ("comments.created_at").where(created_at: @range)
BlogPost.includes (:comments).where('comments.created_at' => @range)
Given this Category model with an attribute for "name", what code would fill in the blank so that it sets saved_name to a string that is the category name that existed before the name was changed?
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1 point
category.name_was
category.saved(:name)
category.changes[:name]
category.name_changed?
Given two models, what is the issue with the query used to fetch them?
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1 point
This query will result in extensive caching, and you will have to then deal with caching issues.
This query will result in the N+1 query issue. Three orders will result in four queries.
This query will result in the 1 query issue. Three orders will result in one query.
There are no issues with this query, and you are correctly limiting the number of Order models that will be loaded.
Which choice is an incorrect way to render a partial?
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1 point
<%= render(:partial => 'shared/product') %>
<%= render('shared/product', :collection => @products) %>
<%= render(template: 'shared/product', with: @products) %>
<%= render('shared/product', locals: { product: @product }) %>
Which code sample will skip running the login_required "before" filter on the get_posts controller action?
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1 point
before_action :login_required, skip: [:get_posts]
skip_before_action :login_required, except: [:get_posts]
skip_before_action :login_required, only: [:get_posts]
skip_action before: :login_required, only: [:get_posts]
Within a Rails model with a cache_key method, which code snippet will expire the cache whenever the model is updated?
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1 point
A
B
C
D
After this migration has been executed, which statement would be true?
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1 point
The galleries table will have no primary key.
The galleries table will include a column named "updated_at".
The galleries table will contain exactly seven columns.
The galleries table will have an index on the position column.
Which code would you add to return a 404 to the API caller if the user is not found in the database?
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1 point
A
B
C
D
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