I'm a newbie...
I know how to use "to_sentence" when I have something like:
<%= #blah.collect {|b| b.name}.to_sentence %>
but what if I have a more complex block like:
<% skill.position.each do |position| %>
<%= position.company.name %>
<% if position.salary? %>
<span><%= position.salary %></span>
<% end %>
<% end %>
The desired output is:
Microsoft, Google 2000, and Yahoo.
Couldn't you just collect it without .each?
<%= skill.positions.collect{ |p| "#{p.company.name}#{position.salary? ? '<span>#{position.salary}</span>' : nil}" }.to_sentence %>
That should work for you...
You could also do this:
<%= skill.position.each do |position| %>
<% position.company.name %>
<% if position.salary? %>
<span><% position.salary %></span>
<% end %>
<% end.to_sentence %>
The to_sentence methods works on Arrays. The reason that it works on your first example...
<%= #blah.collect {|b| b.name}.to_sentence %>
... is because the collect method returns an Array. The each method in your second example will also work because each also returns an Array. So, this will work:
<% blah.each do |b| %>
...
<% end.to_sentence %>
Related
I want to understand the erb usage. In the below code I am unable to figure out how to get the value of (group.id) in the if clause using the erb tags.
This probably has a very basic solution but I am unable to get proper answers.
The below code gives me syntax error.
<% current_user.favorite_groups.to_a.each do |group| %>
<%= if (group.id).newfavorite_texts.exists?(id: text.id) %>
<%= group.name %>
<%= link_to # do something %>
<% else %>
<%= group.name %>
<%= link_to # do something else %>
<% end %>
<% end %>
Thanks in advance.
You should be get going with the below code
<% current_user.favorite_groups.to_a.each do |group| %>
<% if group.newfavorite_texts.exists?(id: text.id) %>
<%= group.name %>
<%= link_to # do something %>
<% else %>
<%= group.name %>
<%= link_to # do something else %>
<% end %>
<% end %>
This is my code.
What I want to do is only show STAXCODE if the state is in this list. AL,FL,CO
<% #ship_states.each do |state| %>
<%= state.STAXCODE %>
<% end %>
try,
<% #ship_states.each do |state| %>
<%= ['AL', 'FL', 'CO'].include?(state.STAXCODE) ? state.STAXCODE : nil %>
<% end %>
How can I simplify the following lines:
<% if #campaign.previous_campaign.present? %>
<%= #campaign.previous_campaign.product_name %>
<% if #campaign.previous_campaign.previous_campaign.present? %>
<%= #campaign.previous_campaign.previous_campaign.product_name %>
<% end %>
<% end %>
I need to keep adding ".previous_campaign" until it is not present. So the next one in the above code would be:
<%= #campaign.previous_campaign.previous_campaign.previous_campaign.product_name %>
etc etc.
Something like this:
<% campaign = #campaign %>
<% while campaign.previous_campaign.present? %>
<% campaign = campaign.previous_campaign %>
<%= campaign.product_name %>
<% end %>
The code may need some debugging, but I guess the idea is clear
You could do something like this:
<% for c in #campaign do %>
<% if c.previous_campaign.present? %>
<%= c.previous_campaign.product_name %>
<% end %>
<% end %>
When I get List of Members in controller, I think #Members is array of ActiveRecord.
member_controller.rb
#members = Member.where(params[:param1])
So I know normally I write below to display.
member.html.erb
<% #members.each do |member| %>
<%= member.name %>
<% end %>
But in case of below, I would like to write index number at least loop 10 times like this.
<% (0..10).each do |idx| %>
<%= idx %>:
<%= members[idx].name %>
<% end %>
But it does not work. It can not be displayed members[idx].name
How can I make it?
Why don't you just use each_with_index method?
<% #members.each_with_index do |member, index| %>
<%= index %>
<%= member.name %>
<% end %>
If you need only 10 records, limit #members at the controller:
#members = Member.where(column: params[:column]).limit(10)
Does this help you?
Fix is
<% (0..10).each do |idx| %>
<%= idx %>:
<%= #members[idx].name %>
<% end %>
You forgot to use #. It should be #members, not members. And, if your query to the controller returns less than 10, then your looping way will crash. You will get the error,NoMethodError like NoMethodError: undefined method name' for nil:NilClass.
You can do as,
<% #members.each_index do |idx| %>
<%= idx %>:
<%= #members[idx].name %>
<% end %>
You can use each_with_index:
<% #members.each_with_index do |member, idx| %>
<%= idx %>:
<%= member.name %>
<% end %>
You could then use limit to limit the number of records returned.
Shouldn't it be
<% (0..10).each do |idx| %>
<%= idx %>:
<%= #members[idx].name %> #you forgot '#'here
<% end %>
Though each_with_index is a better option here
Thank you all. It worked!!
<% (0..10).each do |idx| %>
<%= idx %>:
<%= #members[idx].nil? ? '': #members[idx].name %>
<% end %>
I created two scaffolds: announce_sections and announcements. The announce_sections are the types of announcements there are (i.e. games, tryouts, etc) and when I create an announcement I specify what type of announce_sections it is. I'm trying to display it so that each announce_section is viewed, with each announcement and its information under the announce_section. This is what I came up with:
<% #announce_sections.each do |announce_section| %>
<%= announce_section.name %>
<% #announcements.each do |announcement| %>
<%= announcement.announcement_title %>
<%= announcement.information %>
<%= announcement.additional_information %>
<%= announcement.type %>
<% end %>
<% end %>
However, this code only displays the announce_sections with the all announcements under it. The announcements don't get separated into their respective announce_sections. How do I change it so that it does?
<% #announce_sections.each do |announce_section| %>
<%= announce_section.name %>
<% #announcements.where(type: announce_section).each do |announcement| %>
<%= announcement.announcement_title %>
<%= announcement.information %>
<%= announcement.additional_information %>
<%= announcement.type %>
<% end %>
<% end %>
Use the name of the field you are using to assign the announcement type instead of 'type'
There are many ways to solve this, but one simple one is to build a hash where the key is the type of announcement_section and the value is an array (or Set) of the announcement. One way to build that hash is to use the Hash.new {|hash, key| ... } form of the constructor.
#hash = Hash.new {|hash, section| hash[section] = Array.new }
#announcements.each do |a|
# for each announcment append it to the array under the hash
#hash[a.section] << a
end
And then, in the view
<% #hash.keys.each do |section| %>
<%= section %>
<% #hash[section].each do |announcement| %>
<%= announcement.announcement_title %>
<%= announcement.information %>
<%= announcement.additional_information %>
<%= announcement.type %>
<% end %>
<% end %>