I'm trying to make an API for a quiz admin I have made.
I have a Quiz model which has_many Questions and has_many Results
The Question model also has_many Answers
I want the url /data/quiz/7 to return all the Questions+Answers and Results to the Quiz with id=7
Here is the method for this I have at the moment.
def quiz
#quiz = Quiz.find(params[:id])
#questions = #quiz.questions.select('id, content') # returns only selected fields
#results = #quiz.results.select('id, content, points_limit') # returns only selected fields
#questions.each do |question|
question['answers'] = question.answers.select('id, content, points') #returns whole object
end
#return = Hash.new
#return['questions'] = #questions
#return['results'] = #results
respond_to do |format|
format.json { render json: #return }
format.xml { render xml: #return }
end
end
Everything works EXCEPT the answers are returning the FULL answer object including created-at, id, updated-at etc etc and all I want are the fields selected in the query like I have.
Why is the .select working for #questions and #results but not the associated #answers?
No matter what I try it seems to ignore the select statement for the answers loop and always return the full object.
--
In console... I know doing the same thing
question.answers.select('id, content, points')
returns exactly what I'm after. So it's something to do with the way I'm putting it into the Array/Hash I'm guessing but still can't work it out.
I think if you try something like this it will work:
#answers = Answer.select([:id, :content, :points])
.where(question_id: #questions.pluck(:id))
This is the same as:
SELECT id, content, points
FROM answers
WHERE question_id in (<question_ids array>)
Related
What i do wrong? I want to return every products which pass condition:
def show
products = Product.select{|x| x[:category_id] == params[:id]}
render json: products
end
When i write
def show
products = Product.select{|x| x[:category_id] == 1}
render json: products
end
it works why the first example doesn't work?
I am pretty sure that there is mismatch in data type.
1=='1' #will be always false
1==1 #will be true
'1'=='1' #will be true as well
And also check for nil value from params[:id]
Please make sure to change as follows
def show
products = Product.select{|x| x.category_id == params[:id].to_i}
render json: products
end
OR
The best solution as suggested by #Eyeslandic is to use .where as it will not check for mismatch in data type. And also you don't have to take care of nil value from params[:id].
You should really be using a where to stop sql from loading all your products.
#products = Product.where('category_is = ?', params[:id])
The being said, if you are sticking to rails restful conventions, the fact you have a param called :id that is the category_id suggests you are on the category controller. So maybe consider changing your logic to:
#category = Category.includes(:products).find(params[:id])
you can then access products via
#category.products
or if your not interested in the category too much maybe
#products = Category.includes(:products).find(params[:id])&.products
I have a model Books and a model Authors.
The form for adding books, contains a nested for allowing to add authors. That works. However, I have an autocomplete function on the authors fields, so when the form is posted to the controller, the author (almost) for sure exists in the database.
I should somehow do a find_or_initialize_by on the nested attributed.
I'm maybe looking at the wrong place, but I can't find this in the rails guides. I tried this (found on SO):
def create
#book = Book.new(params_book)
small_name = params[:book][:authors_attributes]["0"]["name"].downcase
aut_id = Author.where("\"authors\".\"name\" = :name",{name: small_name}).pluck(:id).join
#book.authors = Author.find_or_initialize_by(id: aut_id)
if #book.save
redirect_to see_book_url(Book.last)
else
render 'new'
end
end
This creates an error:
undefined method `each' for #<Author:0x007fac59c7e1a8>
referring to the line #book.authors = Author.find_or_initialize_by(id: aut_id)
EDIT
After the comments on this question, I updated the code to this:
def create
book_params = params_book
small_name = params[:book][:authors_attributes]["0"]["name"].downcase
id = Author.where("\"authors\".\"name\" = :name",{name: small_name}).pluck(:id).join
book_params["authors_attributes"]["0"]["id"] = id
#book = Book.new(book_params)
if #book.save
redirect_to see_book_url(Biblio.last)
else
....
The book params look like this:
<ActionController::Parameters {"title"=>"Testus Testa",
"authors_attributes"=><ActionController::Parameters {
"0"=><ActionController::Parameters {"name"=>"Vabien", "id"=>"22"}
permitted: true>} permitted: true>} permitted: true>
That looks fine to me, BUT, I get this error:
ActiveRecord::RecordNotFound in Administration::BooksController#create
Couldn't find Author with ID=22 for Book with ID=
Ok so the easiest way to get what you want is to change autocomplete in your form from an array of names like: ['author 1 name', 'author 2 name'] change it to an array of objects containing the name and id of the author like: [{label: 'author 1 name', value: 0}, {label: 'author 2 name', value: 1}] so then as long as that form field is now for "id" instead of "name" then in your controller all you have to do is:
def create
#book = Book.new(params_book)
if #book.save
redirect_to see_book_url(Book.last)
else
render 'new'
end
end
Because only attributes without an ID will be created as new objects. Just make sure you set accepts_nested_attributes_for :authors in your Book model.
The error you are getting is because #book.authors is a many relationship so it expects a collection when you set it not an individual author. To add an individual author to the collection you do #book.authors << Author.find_or_initialize_by(id: aut_id) instead of #book.authors = Author.find_or_initialize_by(id: aut_id) although its redundant to fetch the id using the name just to initialize with an id. The id will be created automatically. Use Author.find_or_initialize_by(name: small_name) instead.
In your current code you have multiple authors being created not only due to the lack of "id" being used but because #book = Book.new(params_book) passes the nested attributes to the object initializer and then after you are accessing the nested attribute params and adding authors again. Also if you have multiple authors with the same name then Author.where("\"authors\".\"name\" = :name",{name: small_name}).pluck(:id).join would actually make an ID out of the combined ID of all authors with that name.
If you want to do it manually then remove :authors_attributes from your permit in "params_book" method so it won't be passed to Book.new then do the following:
def create
#book = Book.new(params_book)
params[:book][:author_attributes].each{|k,v| #book.authors << Author.find_or_initialize_by(name: v['name'])}
if #book.save
redirect_to see_book_url(Book.last)
else
render 'new'
end
end
Let me know if you have trouble!
After response from poster
remove :authors_attributes from your permit in "params_book" method and try this:
def create
#book = Book.new(params_book)
#book.authors_attributes = params[:book][:author_attributes].inject({}){|hash,(k,v)| hash[k] = Author.find_or_initialize_by(name: v['name']).attributes.merge(v) and hash}
if #book.save
redirect_to see_book_url(Book.last)
else
render 'new'
end
end
Solved, thanks a lot to Jose Castellanos and this post:
Adding existing has_many records to new record with accepts_nested_attributes_for
The code now is:
# the strong params isn't a Hash, so this is necessary
# to manipulate data in params :
book_params = params_book
# All registrations in the DB are small case
small_name = params[:book][:authors_attributes]["0"]["name"].downcase
# the form sends the author's name, but I need to test against the id:
id = Author.where("\"authors\".\"name\" = :name",{name: small_name}).pluck(:id).join
book_params["authors_attributes"]["0"]["name"] = params[:book][:authors_attributes]["0"]["name"].downcase
# this author_ids is the line that I was missing! necessary to
# test whether the author already exists and avoids adding a
# new identical author to the DB.
book_params["author_ids"] = id
book_params["authors_attributes"]["0"]["id"] = id
# the rest is pretty standard:
#book = Book.new(book_params)
if #book.save
redirect_to see_book_url(Book.last)
else
Could someone take a look at my code and let me know if there is a better way to do this, or even correct where I'm going wrong please? I am trying to create a new row for each venue and variant.
Example:
venue_ids => ["1","2"], variant_ids=>["10"]
So, I would want to add in a row which has a venue_id of 1, with variant_id of 10. And a venue_id of 2, with variant_id of 10
I got this working, and it's now passing in my two arrays. I think I am almost there I'm not sure the .each is the right way to do it, but I think that I'm on the right track haha. I have it submitting, however, where would I put my #back_bar.save? because this might cause issues as it won't redirect
Thanks in advance.
def create
#back_bar = BackBar.new
#venues = params[:venue_ids]
#productid = params[:product_id]
#variants = params[:variant_ids]
# For each venue we have in the array, grab the ID.
#venues.each do |v|
#back_bar.venue_id = v
# Then for each variant we associate the variant ID with that venue.
#variants.each do |pv|
#back_bar.product_variant_id = pv
# Add in our product_id
#back_bar.product_id = #productid
# Save the venue and variant to the DB.
if #back_bar.save
flash[:success] = "#{#back_bar.product.name} has been added to #{#back_bar.venue.name}'s back bar."
# Redirect to the back bar page
redirect_to back_bars_path
else
flash[:alert] = "A selected variant for #{#back_bar.product.name} is already in #{#back_bar.venue.name}'s back bar."
# Redirect to the product page
redirect_to discoveries_product_path(#back_bar.product_id)
end
end # Variants end
end # Venues end
end
private
def back_bar_params
params.require(:back_bar).permit(:venue_id,
:product_id,
:product_variant_id)
end
as i said in comments
this is untested code and just showing you how it's possible to do with ease.
class BackBar
def self.add_set(vanue_ids, variant_ids)
values = vanue_ids.map{|ven|
variant_ids.map{|var|
"(#{ven},#{var})"
}
}.flatten.join(",")
ActiveRecord::Base.connection.execute("INSERT INTO back_bars VALUES #{values}")
end
end
def create
# use in controller
BackBar.add_set(params[:venue_ids], params[:variant_ids])
# ...
end
I have objects with a 'position' defined. I 'm moving one object (using jQuery Sortable), then I need to reindex the position of each object in that list (I want to keep them in order 0,1,2...n)
Basically we have a ProductLine model that contains Products (using act_as_list for convinience).
First, swap the position of the previous object and the new object (the one we just dropped here):
def sort
#product = Product.find(params[:id])
if(params.has_key?(:next_id))
#next_product = Product.find(params[:next_id])
end
if(params.has_key?(:prev_id))
#prev_product = Product.find(params[:prev_id])
end
if #prev_product.blank?
#product.move_to_top
elsif #next_product.blank?
#product.move_to_bottom
else
#product.insert_at(#prev_product.position)
end
#product.save
reindex #product.product_line_id
render json: #products
end
This is the reindex function that ensures they are sequential:
def reindex(product_line_id)
#products = Product.where(product_line_id: product_line_id).order(position: :asc)
#products.each_with_index { |p, index|
p.position = index
p.save
}
end
I'm quite new to the Ruby language and I'm sure there are several cleaner, more efficent ways of doing this?
What I'm trying to do: I have a model "Recipe" in which I defined a method "search" that takes an array of strings from checkboxes (I call them tags), and a single string. The idea is to search the db for recipes that has anything in it's 'name' or 'instructions' that contains the string, AND also has any of the tags matching it's 'tags' property.
Problem: The search method return all the recipes in my db, and doesn't seem to work at all at finding by the specific parameters.
The action method in the controller:
def index
#recipes = Recipe.search(params[:search], params[:tag])
if !#recipes
#recipes = Recipe.all
end
respond_to do |format|
format.html
format.json { render json: #recipe }
end
end
The search method in my model:
def self.search(search, tags)
conditions = ""
search.present? do
# Condition 1: recipe.name OR instruction same as search?
conditions = "name LIKE ? OR instructions LIKE ?, '%#{search[0].strip}%', '%#{search[0].strip}%'"
# Condition 2: if tags included, any matching?
if !tags.empty?
tags.each do |tag|
conditions += "'AND tags LIKE ?', '%#{tag}%'"
end
end
end
# Hämtar och returnerar alla recipes där codition 1 och/eller 2 stämmer.
Recipe.find(:all, :conditions => [conditions]) unless conditions.length < 1
end
Any ideas why it return all records?
if you are using rails 3, then it is easy to chain find conditions
def self.search(string, tags)
klass = scoped
if string.present?
klass = klass.where('name LIKE ? OR instructions LIKE ?', "%#{string}%", "%#{string}%")
end
if tags.present?
tags.each do |tag|
klass = klass.where('tags LIKE ?', "%#{tag}%")
end
end
klass
end
When you do
search.present? do
...
end
The contents of that block are ignored - it's perfectly legal to pass a block to a function that doesn't expect one, however the block won't get called unless the functions decides to. As a result, none of your condition building code is executed. You probably meant
if search.present?
...
end
As jvnill points out, it is in general much nicer (and safer) to manipulate scopes than to build up SQL fragments by hand