rails 4 users reviews for users how to do this [cl

问题:

Closed. This question needs to be more focused. It is not currently accepting answers.

---

Want to improve this question? Update the question so it focuses on one problem only by editing this post.

Closed 6 years ago.

i want create reviews for users from users, how better create db and Active Record Associations, i am thinking of create model reviews, reviews table with content string and table users_users with 2 strings user_id, user_id, first string who create review and second for whom created review, or this wrong way?

回答1:

Although your question is very vague, I'm guessing you're quite new to Rails, so I thought I'd write this post for you

---

User has_many Reviews

Sounds to me like you need help with ActiveRecord associations, which will allow you to create Reviews from Users

Specifically, you'd want to use the has_many relationship, so that a user has_many reviews:

You'd set up 2 models like this:

#app/models/review.rb
class Review < ActiveRecord::Base
    belongs_to :user
end

#app/models/user.rb
class User < ActiveRecord::Base
    has_many :reviews
end

This will allow you to call the User's ActiveRecord objects like this:

#app/controllers/users_controller.rb
def index
   @user = User.find(params[:id])
   @reviews = @user.reviews
end

---

Saving Reviews to Users

Having this setup will allow you to save reviews to specific users

To do this, you'll be able to either use accepts_nested_attributes_for or in the reviews controller, you can merge the user_id of the current user to assign a value to the "foreign key" (user_id) column ActiveRecord uses in its association

The latter is the most straightforward to explain, so I'll give you a demo:

#app/controllers/reviews_controller.rb
def new
    @review = Review.new
end

def create
    @review = Review.new(review_params)
    @review.save
end

private
def review_params
    params.require(:review).permit(:title, :body).merge(:user_id => current_user.id)
end


#app/views/reviews/new.html.erb
<%= form_for @review do |f| %>
    <%= f.text_field :title %>
    <%= f.text_field :body %>
<% end %>

This will save the review you post with an attached user_id, which you can then call with something like @user.reviews

Hope this helps?

回答2:

I think you can limit this to one new model UserReview, something like:

rails g model UserReview for_user:references by_user:references content:text stars:integer

And the model definition with two scopes:

def UserReview
  belongs_to :for_user, class_name: 'User'
  belongs_to :by_user, class_name: 'User'

  scope :reviews_for, ->(user) { where("for_user = ?", user) }
  scope :reviews_by,  ->(user) { where("by_user = ?", user) }
end

The scope methods allow for easier querying of reviews like:

user_reviews = UserReview.reviews_for(current_user)