ruby - Many to many and one to many association between same models -

-

itemprop = "text">

I am creating a simple synatra app for my ORM, / P>

  • There can be multiple users of an event, one of which is "owner".
  • Users have multiple instances,

Here is a simplified version of my schema / model definitions: 

  class users & lt; Sequel :: Models (: Users) many_to_many: Event_it_on: Event and Class Event & lt; Sequel :: Models (: Events) many_to_many: Users multiple_to_one: User End provides a link between # users and event # Eg. Event.users or user.events # I am unsure how it is necessary :) db.create_table: events_users primay_key: id foreign_key: event_id ,: events foreign_key: user_id ,: users end

This allows me to get users connected to an event, or users who are connected to a user, but I am struggling to express the "ownership" of an event. It seems that the following pseudocode will work: 

  my_user = User.all.first Owned_Avents = Event.where (user_id = my_user.user_id)

that Two questions lead to:

  1. Is the way I am using Assurance, does that mean?
  2. How do I express ownership of an event in relation to Sequel's Association model?

    3. Something like this: 

      class event many_to_one : Owner, class = & gt; User: many_to_many: user and class user one_to_many: own_events, class =>: event :: key = & gt ;: owner_id many_to_many: event end
    < P> You must be added to the Ownership / ID> field Event table.

    Usage:

    User = User. First event = Event.new (: title = & gt; 'new event') events.add_owner (user) event.save Other_user = User.create (: name = & gt; 'jack') event.add_user (another_user) < / Code>

Comments

Post a Comment

Popular posts from this blog

java - org.apache.http.ProtocolException: Target host is not specified -

-
I have written a simple httprequest / response code and I am getting this error below: I used to type in my classpath httpclient, httpcore, common -Codecs and general logging. I am very new to Java and I do not know what's going on here. Please help me. code: import org.apache.http.client.HttpClient; Import org.apache.http.client.methods.HttpGet; Import org.apache.http.HttpResponse; Import org.apache.http.impl.client.HttpClientBuilder; Import org.apache.http.Header; Import org.apache.http.HttpHeaders; Public class UnshorteningUrl {public static zero main (string [] args throws exception {HttpGet request = zero; HTTP Client Client = HTTP ClientBuilder.credit (). Build (); Try {Request = New HTTP Gate ("trib.me/1lBFzSi"); HttpResponse httpResponse = client.execute (request); Header [] header = httpResponse.getHeaders (HttpHeaders.LOCATION); // Preconditions.checkState (headers.length == 1); String new url = header [0] .getValue (); System.out.println ("new url...
Read more

java - Gradle dependencies: compile project by relative path -

-
Is it possible to specify a dependency on another gradeal project in the granular (in android studios) outside the current project limits? For example, with a relative path like this: dependence {collection project ('../../ stdlib / dagger'}} MyApp (path / user / foo / workspace / mypad) The app (Path / User / Foo / Workspace / MyPass / App) And I have an Android Library Project with 3 subdomules: stdlib (path is / user / foo / Utilities (Path / User / Foo / Workspace / Stadlib / Utilis) http (Path / User / Foo / Workspace / Stadlib / HT) / Li> What I have to do is compile the Dagger, Util, http module in the MyApp project. The Stidelib Library module under heavy development And MyApp will grow in the form of Growth, so I do not want to push them into a Mewen repository. I am a little change. is likely to add another Gredle projects in some way? I will push the study library into the Maven repository after the source is in search of a temp...
Read more

ruby on rails - Object doesn't support #inspect when used with .include -

-
So I have participated in a glitch error that I do not even know how to debug. I am very new to the railing, so it has kicked my ass well when I use the .includes (school) seen by the student, it gives a blue box error, But when I look at any other model and .includes (school) , the school works just fine. class student & lt; ActiveRecord :: Base has has_many: relationships, foreign_key: "liker_id", dependent :: has_many: matches, foreign_key: "student_1_id", dependent :: deleted belong_to: school belong_to: conference belong_to: would_you_rather belong_to: home city belong_to: year is_to: Major and class school & lt; on the console activatecord :: Affiliate for the base: conference includes: respondent, class: "school", foreign_key: "rival_id" (e.g. For: School) Select SQL generated Select "School". * "School" from "school" "ID" IN (1) error message back NoMethodError: u...
Read more