Rails：从表单向服务器发送一系列哈希

Question

In my parameters hash, I am trying to achieve something like the following:

{"utf8"=>"✓", "authenticity_token"=>"6A14fVUEWQSB83j2BsYKn", "search"=>{"keywords"=>[{"keyword_names"=>"color", "keyword_conditions"=>"is not", "keyword_values"=>"red"}, {"keyword_names"=>"size", "keyword_conditions"=>"is", "keyword_values"=>"3"}] , "assignee_id"=>"", "begin_date"=>"", "end_date"=>""}, "commit"=>"search"}

Notice the following:

"keywords"=>[{"keyword_names"=>"color", "keyword_conditions"=>"is not", "keyword_values"=>"red"}, {"keyword_names"=>"size", "keyword_conditions"=>"is", "keyword_values"=>"3"}]

However, this is what is currently being sent:

  Parameters: {"utf8"=>"✓", "authenticity_token"=>"6A14fVUEWQSB83j2BsYKn", "keyword_names"=>["name", "name"], "keyword_conditions"=>["is", "is"], "keyword_values"=>["dan", "john"], "search_add"=>"and", "search"=>{"assignee_id"=>"", "begin_date"=>"", "end_date"=>""}, "commit"=>"search"}

Notice keyword_names, keyword_conditions, and keyword_values is not part of the search hash. How can I make it part of the search hash?

This is what I have:

  <%= link_to "Add", "#", class: 'add_search'  %>
  <div class="search_container">
    <%= text_field_tag "keyword_names[]" %><%= select_tag "keyword_conditions[]", options_for_select(["is", "is not","is like"]) %><%= text_field_tag "keyword_values[]" %>
  </div>

Answer 1

Following this structure of the params:

keywords: 
  [
    { keyword_names: 'color', keyword_conditions: 'is not', keyword_values: 'red' }
  ]

You should name your input like this:

0..3.each do |index|
  text_field_tag "keywords[#{index}][keyword_names]"
  select_tag "keywords[#{index}][keyword_conditions]", options_for_select(['is', 'is not', 'is like'])
  text_field_tag "keywords[#{index}][keyword_values]"
end

Where the 0..3.each do |index| is a loop defining 4 different sets of 3 inputs for each keyword. So params[:keywords].size should return 4