Some searches don't work - ruby-on-rails

Question

I would like to set up three search forms but the two(name and place) of the three don't work. I don't understand why it makes them different because the codes for them are almost the same.
☆members_controller
def index
if !checklogin? then return end #
if params[:name].present?
#members = Member.where("name like ?" , "%" + params[:name] + "%")
else
#members = Member.all
end
if params[:place].present?
#members = Member.where("place like ?" , "%" + params[:place] + "%")
else
#members = Member.all
end
if params[:field].present?
#members = Member.where("field like ?" , "%" + params[:field] + "%")
else
#members = Member.all
end
respond_to do |format|
format.html # index.html.erb
format.json
end
end
☆members_index(view)
<div class= "form_index">
<%= form_tag({:action=>"index"}, {:method=>"get"}) do %>
<div class="from_field_index">
<%= label_tag 'name', '名前検索:' %>
<%= text_field_tag 'name' %>
<%= submit_tag '検索' %>
<% end %>
</div>
</div>
<div class= "form_index">
<%= form_tag({:action=>"index"}, {:method=>"get"}) do %>
<div class="from_field_index">
<%= label_tag 'place', '活動場所検索:' %>
<%= text_field_tag 'place' %>
<%= submit_tag '検索' %>
<% end %>
</div>
</div>
<div class= "form_index">
<%= form_tag({:action=>"index"}, {:method=>"get"}) do %>
<div class="form_field_index">
<%= label_tag 'field', '言語分野検索:' %>
<%= text_field_tag 'field' %>
<%= submit_tag '検索' %>
<% end %>
</div>
</div>
☆command-field search
Processing by MembersController#index as HTML
Parameters: {"utf8"=>"✓", "field"=>"rails", "commit"=>"検索"}
Member Load (0.4ms) SELECT "members".* FROM "members"
CACHE (0.0ms) SELECT "members".* FROM "members"
Member Load (0.2ms) SELECT "members".* FROM "members" WHERE (field like '%rails%')
Member Load (0.1ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
Rendered members/index.html.erb within layouts/application (3.7ms)
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
☆command-place search(bad case)
Started GET "/members?utf8=%E2%9C%93&place=%E6%A8%AA%E6%B5%9C&commit=%E6%A4%9C%E7%B4%A2" for 127.0.0.1 at 2013-12-03 13:47:20 +0900
Processing by MembersController#index as HTML
Parameters: {"utf8"=>"✓", "place"=>"横浜", "commit"=>"検索"}
Member Load (0.2ms) SELECT "members".* FROM "members"
CACHE (0.0ms) SELECT "members".* FROM "members"
Member Load (0.2ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
Rendered members/index.html.erb within layouts/application (6.5ms)
CACHE (0.0ms) SELECT "members".* FROM "members" WHERE "members"."id" = ? LIMIT 1 [["id", 17]]
Rendered layouts/_header.html.erb (1.6ms)
Rendered layouts/_footer.html.erb (0.1ms)
Completed 200 OK in 96ms (Views: 73.5ms | ActiveRecord: 1.1ms)

Answer 1

I think what you need is to preserve #members:
# Rails 4
#members = Member.all
# Rails 3
#members = Member.scoped
if params[:name].present?
#members = #members.where("name like ?" , "%" + params[:name] + "%")
end
if params[:place].present?
#members = #members.where("place like ?" , "%" + params[:place] + "%")
end
if params[:field].present?
#members = #members.where("field like ?" , "%" + params[:field] + "%")
end
Note there is just one call to all. Note also that in Rails 4 you would use all, while in Rails 3 you would use scoped.