<% Schedule.all.each do |schedule| %>
<%= link_to schedule.county, events_path(County: schedule.county) %>
Displays duplicates in the Schedule table
I've tried all below without luck in displaying no duplicates.
<% Schedule.all.each.uniq do |schedule| %>
<% Schedule.distinct.pluck(:county) do |schedule| %>
<% Schedule.distinct.each.pluck(:county) do |schedule| %>
They display nothing for some reason.
Edit:
Associations --
Event has_many :schedules, inverse_of: :event
Schedule belongs_to :event
So the original each block does bring in what I want but grabs the county for each schedule in the database. This results in duplicate county listings. I'm trying to remove these duplicates which I presumed was simple enough by adding a uniq method to the statement but looks like it requires joins. Thanks.
It depends on the association between schedule and country model. Assuming Schedule belongs to country
<% Schedule.joins(country).select(:country).distinct.each do |schedule| %>
<%= link_to schedule.county, events_path(County: schedule.county) %>
<% end %>
<% Schedule.select(:county).distinct.each do |schedule| %>
So looks like I didn't need a join. It was more just a select and then use distinct method which works. Thanks #Tacyons for putting me in the right direction.
Related
I'm creating a application using ruby on rails, but currently i'm suffering a problem like db relation, below my code:
Company
has_many :posts, :foreign_key => :company_id
Post
belongs_to :companies, :foreign_key => :company_id
controller
#post = current_user.companies.all
view
<% #post.each do |p| %>
<%= p.posts.post_title %>
<% end %>
Showing error above code.
If I debug like use <%= debug p.posts %> then showing all posts, which is under my companies but when I use <%= debug p.posts.post_title %> then showing ActiveRecord_Associations_CollectionProxy:0x0000000e490b98
Thanks
I think the problem here is that you are trying to call the method :post_title on p.posts, which is an ActiveRecord::Associations::CollectionProxy object.
In your example, p is a Company object, which has a method posts, which returns to you a CollectionProxy object that acts a lot like a list of posts. That list will not have a method post_title, but each element of that list will have a method post_title
So, instead of
<% #post.each do |p| %>
<%= p.posts.post_title %>
<% end %>
You will want something like:
<% #post.each do |company| %>
<% company.posts.each do |post| %>
<%= post.post_title %>
<% end %>
<% end %>
Two additional things to note:
1) The variable #post is inaccurately named. Inaccurate variable names will lead to confusion when trying to understand what is happening. current_user.companies.all returns a list of companies, and therefore, it should read:
#companies = current_user.companies.all
not
#post = current_user.companies.all
2) The actual error that is being shown to you likely says something like
Undefined Method 'post_title' for ActiveRecord_Associations_CollectionProxy:0x0000000e490b98
Not just
ActiveRecord_Associations_CollectionProxy:0x0000000e490b98
When debugging and asking for help, it's very important to note the entire message of the exception being raised.
Because companiy has_many :posts........ posts are objects you need a loop to show all posts e.g
p.posts.each do |post|
I have three tables: illness, symptom and a secondary table to link the other two on a has_many through: relationship.
I wish to implement a system where users type in their symptoms and receive a list of possible illnesses.
Using the code below I can use find(1,2), for example, to show all illnesses that have symptoms 1 and 2 simultaneously. However, I want these two constants to be user-supplied data fed through a form. I'm somewhat new to RoR so I don't know how to do this.
symptoms = Symptom.find(params[:symptom_ids]) # symptom_ids is an array of ids
illnesses = Illness.joins(illness_symptoms: :symptom)
.where("symptoms.id in (?)", symptoms)
.group("illnesses.id")
.having("count(illnesses.id) >= ?", symptoms.length)
In the model:
scope :with_symptoms, -> (symptoms) { joins(illness_symptoms: :symptom)
.where("symptoms.id in (?)", symptoms)
.group("illnesses.id")
.having("count(illnesses.id) >= ?", symptoms.length) }
I use these with Illness.with_symptoms(Symptom.find(1,2)) (I'm looking for a way to replace 1,2 with user-supplied data).
You can do something like this in a form:
<% form_tag some_path do %>
<% #symptoms.each do |symptom| %>
<%= label_tag do %>
<%= check_box_tag "symptom_ids[]", symptom.id %>
<%= symptom.name %>
<% end %>
<% end %>
<% end %>
User will be able to use checkboxes to choose symptoms.
I found it difficult to title this question. It is easier if you see the situation:
by having this in my view
<% #scrapbook.scrapbook_entries.each do |d|%>
<%= d.recipe_id %>
<% end %>
I am given a list of recipe id's (3 of them) that are in the scrapbook_entries database table.
358 358 341
What I want to do is use these ID's and search the recipe table for all the information linked to them.
E.g. Display #recipe.name with ID 358.
Is there an easy way to do this in the view? Let me know if I am not making sense
If I understand you well, you can immediately put something like
= d.recipe.name
Behind the scenes, this will use your recipe id to look up the correct record, then take the name atttribute of this record
Try this:
<% #scrapbook.scrapbook_entries.each do |d|%>
<%= d.recipe_id %>
<%= d.recipe ? d.recipe.name : '' %>
<% end %>
If you have the relationship defined on the ScrapbookEntry model you can get the recipe instance and access any of its attributes.
class ScrapbookEntry < ActiveRecord::Base
belongs_to :recipe
end
<% #scrapbook.scrapbook_entries.each do |d|%>
<%= d.recipe.name %>
<% end %>
you can add a delegate in your scrabook_entry
delegate :name, :to => :recipe
than in your view
d.name
There is 'FoodType' model which are describes types of food in restaurants. I need to make view for creating a new restaurant, and I need to have list of checkboxes in order to allow user to setup types of food for each restaurant. I want to have something like this:
<% FoodType.all.each do |food_type| %>
...
<div class="row">
<%= f.check_box :food_types[0] %>
</div>
...
<% end %>
I want to have parameters like params[restaurant][food_types][0] = true in order to make some actions after creating. Please, tell me, how can I do it? Thanks in advance.
Presumably you have a join table which joins restaurants and food types? Let's say that you have one called restaurant_food_types (with a model RestaurantFoodType), which has restaurant_id and food_type_id?
You will then have this association in restaurants:
Restaurant < ActiveRecord::Base
has_many :restaurant_food_types
has_many :food_types, :through => :restaurant_food_types
This will give you the method .food_type_ids which you can call on a restaurant to set the joins. It's this method that you should hook into in your form: it expects an array of ids, so you need to set up an array-style parameter (one where the name ends in []) You may need to use check_box_tag rather than .check_box, to access an array-style parameter name: i would do this:
<% form_for #restaurant do |f| %>
<% FoodType.all.each do |food_type| %>
...
<div class="row">
<%= check_box_tag "restaurant[food_type_ids][]", food_type.id, #restaurant.food_type_ids.include?(food_type.id) %><%= food_type.name %>
</div>
...
<% end %>
<%= f.submit "Save" %>
<% end %>
Like i say i'm using a check_box_tag here but there might be a nicer way to hook into the food_type_ids method.
Is it possible to call the include? function on a whole table, like this?
<% #user.games.each do |g|
##latestround = g.rounds.order('created_at DESC').first
%>
<% if ##latestround.submittedpictures.isFinalPicture.include?(true) %>
<p>FinalPicture has been played!</p>
<% end %>
<% end %>
The problem i'm getting is that It only works when I put a block on submittedpictures and then loop through each record of this table. However I want to look through the whole table in one go and see if the column 'isFinalPicture' includes a value with 'false'.
Any ideas?
The following snippet works but its not the way i want it (I would get more lines if the round happens to have more 'true' FinalPictures)
<% ##latestround.submittedpictures.each do |s| %>
<% if s.isFinalPicture == true %>
<p>Final Picture has been played!</p>
<% end %>
<% end %>
You could make a scope for it like
class SubmitedPricture << ActiveRecord::Base
scope :final_pictures, where('isFinalPricture = ?', true)
end
then you could see if there is any with only one query
latestround.submittedpictures.final_pictures.any?
Also you should follow the conventions of Rails in naming your Models and everything else. Like submittedpictures should be submitted_pictures