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Creating an if statement inside a hash in a model

I am trying to display all residents in pdf and their dependents, but the dependents have no rack, which they identify by the external user of the resident's user_id. for example resident1.id = 5 --- dependent3.user_id = 5 mean dependent3 belongs to resident1 and so if I want to display the dependent position what should I do and I would like to display all residents and their dependents and booth information for dependents must have information about the booth of the resident to which the dependent belongs. now my information needs to be inside the hash so that it can generate my pdf file ..

my code

data = [] c = 1 resident.each do | r | data <<{"Full name" => r.firstname, "Lastname" => r.lastname, "Street-Number" => r.stand.street_no, "street Name" => r.stand.streetname} if r .stand || r.user_id = r.id end

remember my dependents and residents are in the same table, but residents don't have user_id foreigh key only dependents.

and my output only displays information about residents who have no dependents.

please anyone who wants to help. Because I don't know if I can, but an if statement inside a hash like:

resident.each do | r | data <<{"Full name" => r.firstname, "Lastname" => r.lastname} if r.stand || r.user_id = r.id {"Street-Number" => r.stand.street_no, "street Name" => r.stand.streetname}

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2 answers


Assuming that .stand.street_no

etc. okay even if it .stand

is false

(since it can be false

and still be called if the part r.user_id == r.id

is true), then the following will work:

data = residents.map do |r|
  hash = { "Fullname" => r.firstname, "Lastname" => r.lastname }
  hash.merge!({ "Street-Number" => r.stand.street_no, "street Name" => r.stand.streetname}) if r.stand || r.user_id == r.id
  hash
end

Explanation:



  • Iterate through each resident and build a hash that contains the values ​​that we know will be used.
  • Conditionally merge!

    in additional keys if the sentence is if

    true.
  • Return hash.

Doing this in map

eliminates the need to pre-glue the array data

or not push the hash every pass through the loop.

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data = []
residents.each do |r|
  tmp_hash = {"Fullname" => r.firstname, "Lastname" => r.lastname}

  if r.stand || r.user_id = r.id
    tmp_hash.merge({"Street-Number" => r.stand.street_no, "street Name" => r.stand.streetname})
  end

  data << tmp_hash

end


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