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Questions - associations

Ruby on Rails assign company_id and job_id in models

Have three models: Company, Job and JobApplications. When submitting the job form, the company_id and job_id are showing up as nil in the rails console. What's the best way to assign both company_id ...
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Ken

ruby-on-rails

ruby

model-view-controller

associations

variable-assignment

Votes: 0

Answers: 0

R: simulating a population where two categorical variables are independent

Background For teaching purpose, I use simulations (mainly in R) to help students (in the social science...no math or stats background) grasping some "tough" concepts/ideas behind some stats...
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NewAtGis

r

dataframe

associations

categorical-data

chi-squared

Votes: 0

Answers: 1

Latest Answer

You can use sample with the replace = argument set as TRUE, and combine the new vectors into variables with data.frame: dat <- data.frame(gender = sample(c("F", "M"), size = 100...
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Andrea M

Building new Model A form from Model B attributes

I'm trying to copy the values from Model A nested attributes to Model B nested attributes. The nested fields are the same in their respective tables. Just the parents are different. I pass the model A...
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Chrismisballs

ruby-on-rails

associations

each

nested-attributes

Votes: 0

Answers: 1

Latest Answer

First I set the variables, then I was able to iterate over them. Is this is the rails way? I don't know but it works and the max number of objects it would iterate over is 20. @routine = Routine.inclu...
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Chrismisballs

Order of aggregation with generalization and specialization

I came across this problem/question when designing a DCD. I have a generalization products and 2 specializations milk and pizza. I have doubts about if should use the aggregation between the order and...
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Nomistake

uml

associations

aggregation

Votes: 0

Answers: 2

Latest Answer

Both diagrams are correct, but have a very different meaning: The first diagram says that an order is an aggregation of products, and these products can be more specialized (e.g. milk and pizza). Thi...
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Christophe

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