如何在不使用Rails的循环的情况下将文本字段数组数据存储在数据库中

Question

I am new in ror and I am trying from 4 hours to store the data of form of textfields array like this

<input type="text" name="custom_field[names][]" class="form-control full-width" placeholder =  "Name">

<input type="text" name="custom_field[length_limit][]" class="form-control full-width" placeholder =  "Length Limit">

I want to store the arrays coming into the form in database columns of name and length limit. I don't want to use loop to do this job.

I am doing this in controller

user = CustomField.create(:name=> params[:names])

But it is giving ERROR: null value in column "name" violates not-null constraint DETAI

params are

{"names"=>["tester", "another tester"], "length_limit"=>["aaaaaa222", "aaaaaa222"]

I am using postgresql

How can I do this?

Answer 1

params[:names] is an array, so it doesn't make sense to save it to a string/text field in postgres, which is what CustomField.create(:name=> params[:names]) does.

Essentially, it expands to CustomField.create(:name=> ["tester", "another tester"]) . If you want to create a separate CustomField record for each name, then you could do something like:

params[:names].each do |name|
  CustomField.create(:name => name)
end

To create the CustomField records with the corresponding length_limit , you could do something like:

params[:names].zip(params[:length_limit]).each do |name, limit|
  CustomField.create(:name => name, :length_limit => limit)
end

Note that this doesn't account for errors where the name s and length_limit s don't match. You might want to add some validation to make sure that all the required data is present.