Roppongi.rb #11 "夜のLT会" https://roppongirb.connpass.com/event/134006/

1. Search Form for Rails
Roppongi.rb #11 2019/06/20(木)
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2. 自己紹介
名前: 神速
GitHub: @sinsoku (アイコン右上)
Twitter: @sinsoku_listy (アイコン右下)
Rails歴: それなり
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3. Searching
1. Elasticsearch
2. Amazon CloudSearch
3. Ransack
4. self implementation
5. other...?
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4. 4

5. controller
def index
@q = Person.ransack(params[:q])
@people = @q.result(distinct: true)
end
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6. view
<%= search_form_for @q do |f| %>
# Search if the name field contains...
<%= f.label :name_cont %>
<%= f.search_field :name_cont %>
# Search if an associated articles.title starts with...
<%= f.label :articles_title_start %>
<%= f.search_field :articles_title_start %>
# Attributes may be chained. Search multiple attributes for one value...
<%= f.label :name_or_description_or_email_or_articles_title_cont %>
<%= f.search_field :name_or_description_or_email_or_articles_title_cont %>
<%= f.submit %>
<% end %>
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7. Pros
• easy to introduce
• realizes complex conditions with Advanced Mode
• searches by associations
• used by many people(, and easy to find references)
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8. Cons
• includes many hack codes for ActiveRecord
• difficult to maintenance
• CI failed on 5-2-stable
!
• I do not like the design about Authorization
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9. Example
Support for Rails 6
https://github.com/activerecord-hackery/ransack/pull/1027
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10. I came up with a new implementation
So, I am developing a gem to replace Ransack.
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11. sinsoku/pickel
Pickel provides methods that make it
easy to build a search form for your
Rails app.
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12. in controller
def index
search_params = Pickel.permit(params, :name, :age_gt, :posts_title_start)
@search = Pickel.search(User, search_params)
@users = @search.result
end
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13. in view
<%= form_for @search do |f| %>
<%# Search records contains the value %>
<%= f.label :name_cont %>
<%= f.search_field :name_cont %>
<%# Search records grater than the value %>
<%= f.label :age_gt %>
<%= f.number_field :age_gt %>
<%# Search records an associated posts.title starts with the value %>
<%= f.label :posts_title_start %>
<%= f.search_field :posts_title_start %>
<%= f.submit %>
<% end %>
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14. Concept (Difference from Ransack)
• refrains hack for ActiveRecord
• basically builds a SQL in ActiveRecord.merge
• (However, Arel is used)
• allows search conditions by the StrongParameter
• uses form_for as it is
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15. Design 1
• handle search conditions with Hash
conditinos = {
name_eq: 'foo',
posts_title_start: 'bar'
}
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16. Design 2
• Convert a condition to Relation
rel_1 = User.where(name: 'foo')
cond = Post.arel_table[:title].start('bar%')
rel_2 = User.joins(:posts).merge(Post.where(cond))
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17. Design 3
• Merge all conditions
rel = rel_1.merge(rel_2)
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18. Is this usable in production?
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19. Sorry, it is still in development.
Once it has been implemented to replace
Ransack, I will be tagged v1.0.0.
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20. Click Watch
!
or Star
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