I have multiple controllers. and I have a method to filter like this.
def filter(filtering_params)
results = where(nil)
filtering_params.each do |key, value|
results = results.public_send(key, value) if value.present?
end
results
end
and from controllers, I will call index or show APIs using filtering params for example like this.
def filtering_params
params.slice(:status, :created_at, :id, :transaction_datetime, :portfolio_external_reference_id, :file_id, :file_name)
end
which I will use while fetching from API like this.
def index
records = Module::Class.filter(filtering_params)
render json: {
data: records
}
end
I want to write a generic method that can be used in cases where I want all the available attributes in the particular model as the filtering_params. is there any better way than writing all the attributes?
I solved it and it's working for me.
def filter_params(params)
values = params.slice(*column_names.map(&:to_sym))
filter(values)
end
I am trying to send the serialized version of a model to a view as a param, using the gem active_model_serializers
#app/serializers/admin_serializer.rb
class AdminSerializer < ActiveModel::Serializer
attributes :id, :email, :access_locked?
end
#app/controllers/dashboard/admins_controller.rb
def index
#search = Admin.search(params[:q])
#admins = #search.result(:distinct => true).page(params[:page]).per(10)
#page_entries_info = view_context.page_entries_info #admins
# render json: #admins
respond_to do |format|
format.html
format.js
format.json {render json: #admins}
end
end
#app/views/dashboard/admins/index.html.erb
<%= debug (ActiveModel::Serializer::Adapter.adapter_class(:json_api).new(ActiveModel::Serializer.serializer_for(#admins.first).new(#admins.first),{}).to_json) %>
<%= debug (#admins.all.map{|admin| AdminSerializer.new(admin).to_json}) %>
Above debugs are yielding the below response:
--- '{"data":{"id":"1","type":"admins","attributes":{"email":"tech#bluesapling.com","access_locked?":false}}}' //returned by the first debug
---
- '{"object":{"id":36,"email":"aubrey_schmitt#feeneykoch.io","created_at":"2016-03-28T05:15:17.546Z","updated_at":"2016-03-28T05:15:17.546Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":20,"email":"alysa_johnston#thompson.io","created_at":"2016-03-28T05:15:16.304Z","updated_at":"2016-03-28T05:15:16.304Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":22,"email":"kristofer.langosh#kunzeluettgen.com","created_at":"2016-03-28T05:15:16.459Z","updated_at":"2016-03-28T05:15:16.459Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":37,"email":"beryl_keler#wiza.biz","created_at":"2016-03-28T05:15:17.624Z","updated_at":"2016-03-28T05:15:17.624Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":5,"email":"wilhelmine_buckridge#crona.io","created_at":"2016-03-28T05:15:15.139Z","updated_at":"2016-03-28T05:15:15.139Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":14,"email":"edward_wisoky#corkery.net","created_at":"2016-03-28T05:15:15.838Z","updated_at":"2016-03-28T05:15:15.838Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":27,"email":"leonor#jerde.biz","created_at":"2016-03-28T05:15:16.848Z","updated_at":"2016-03-28T05:15:16.848Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":2,"email":"carley#wyman.net","created_at":"2016-03-28T05:15:14.873Z","updated_at":"2016-03-28T05:15:14.873Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":10,"email":"ervin.gleichner#cremin.org","created_at":"2016-03-28T05:15:15.527Z","updated_at":"2016-03-28T05:15:15.527Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":15,"email":"lonzo.dickens#johnscole.name","created_at":"2016-03-28T05:15:15.916Z","updated_at":"2016-03-28T05:15:15.916Z"},"instance_options":{},"root":null,"scope":null}'
In the first debug I am serializing only one object, while in the second one I am trying to do it for an array of objects.
The first debug is correctly returning the serialized version of the object(in json_api format) while second debug is not.
Tried ArraySerializer as well, with no success: ActiveModel::Serializer::ArraySerializer.new(#admins, each_serializer: AdminSerializer).as_json
how do I achieve the desired serialization. Moreover, if achieved, can I used some other simplified version of this? As this debug statement is way too verbose.
Tried all the solutions mentioned here - How do you initialize an ActiveModel::Serializer class with an ActiveRecord::Relation array?
The basic problem which I am trying to solve is, in the index method of the Admin controller, the Admin object is passed as a PORO to the index.html file. But I want the serialized json version of this object so that I can pass it to my react components as a prop
index method is rendering proper json on firing http://dashboard.localhost.com:3000/admins.json
UPDATE#1 for the index method
def index
#search = Admin.search(params[:q])
#admins_array = #search.result(:distinct => true).to_a
if params[:page]
#admins = #search.result(:distinct => true).page(params[:page][:number]).per(10)
#admins_json_array = Kaminari.paginate_array(#admins_array).page(params[:page][:number]).per(10)
else
#admins = #search.result(:distinct => true).page(1).per(10)
#admins_json_array = Kaminari.paginate_array(#admins_array).page(1).per(10)
end
#admins_json = ActiveModel::SerializableResource.new(#admins_json_array.to_a)
...
...
...
end
I have a controller that I need to specify the serializer in, due to wanting different attributes from the default serializer.
In Controller:
def index
search = User.ransack(search_params)
render json: search.result, each_serializer: MembershipRenewalSerializer::MemberSerializer
end
So, just to get things working, what happens if you specify the each_serializer option?
Edits:
Outside Controller:
ActiveModel::SerializableResource.new(
User.first(2),
each_serializer: MembershipRenewalSerializer::MemberSerializer
).to_json
Note, that without specifying each_serializer, SerializableResource would use the UserSerializer.
Edit #2,
It looks like there is something weird happening with the #admins data.
Try converting to an array:
ActiveModel::SerializableResource.new(#admins.to_a).to_json
Edit #3
To paginate your array, try the following:
#search = Admin.search(params[:q])
#results = #search.result(:distinct => true).to_a
#admins = Kaminari.paginate_array(#results).page(params[:page]).per(10)
Follow the guide: Serializing before controller render
You could use ActiveModel::SerializableResource.new(#admins, adapter: :json_api).to_json
in index.html.erb
<%= debug (ActiveModel::SerializableResource.new(#posts, adapter: :json_api).to_json) %>
below is the output(using posts)
'{"data":[{"id":"1","type":"posts","attributes":{"title":"first post","body":null}},{"id":"2","type":"posts","attributes":{"title":"second post","body":null}}],"links":{}}
I create a concern with some API helper methods and there you can check if its a collection pass find the appropiate serializer and pass it to the collection serializer.
def api_response(data)
render json: wrap_answer(data)
end
def wrap_answer(data)
if data.respond_to?(:each)
ActiveModel::Serializer::CollectionSerializer.new(data, each_serializer: ActiveModel::Serializer.serializer_for(data.first))
else
data
end
end
should have made that into string and use json.stringify to make that as a string and make your life easy
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
I'm trying to make a timeline for an the bugs and updates for an open source project. I'm new to ruby, but I'm getting some experience gradually.
I've created a table called historical_gems, with the following code in the model:
class HistoricalGem < ActiveRecord::Base
attr_accessible :build_date, :version
belongs_to :ruby_gem, :foreign_key => :gem_id
end
I'm using a JS Plugin (http://almende.github.com/chap-links-library/js/timeline/doc) that requires objects with two field names ('start' for the date and 'content' for the title) in the JSON Array to display the timeline using JS.
I believe I have to do something like this in the controller which defines my timeline method to render the JSON:
def timelinem
#name = params[:id]
#rpm = AbcTable.find_by_name(#name)
respond_to do |format|
format.json { render :json => #rpm.json_timelines }
end
end
Then I probably would have to define a 'json_timelines' method inside my model, maybe something like:
def json_timelines(gems = [])
dates = []
gem_id.each { |p|
gems << p
dates << p.build_date(gems)
end
}
end
I'm only starting out with RoR, and even after hours with guides and tutorials and debugging, I'm not able to put together this code. Can anyone help me out, please? I don't think I'm doing it right.
btw, don't be too harsh if I overlooked something obvious, I'm only 16 :)
The render :json => ... in your code should work fine (but with HistoricalGem instead of AbcTable) as long as json_timelines returns an object that's serializable as JSON (e.g., an Array or a Hash).
Try something like this for your method definition:
def json_timelines(gems = [])
gems.map do |g|
{
:content => g.title,
:date => g.build_date
}
end
end
The above snippet assumes your "historical_gems" table has "title" and "build_date" columns; if not, adjust the code to reflect the fields you actually want represented in your JSON.
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>)