So far I have a collection of programmes. A programme has an associated account and there are (currently) six different "types" of accounts that a programme can belong to.
I need to be able to dump out all the programmes but group them by the type of account they are.
Something like;
Alpha Type;
- Programme One
- Programme Two
- Programme Three
Beta Type;
- Programme Four
- Programme Five
Delta Type;
- Programme Six
So far all I have managed is to join the associated table and do an order by the account_type :name
<% #programmes.each do |programme| %>
<%= programme.account_type.name %>
<% end %>
Which will print out the programmes in a reasonable order but I don't know how to do the grouping.
I am using Postgres if that actually makes it easier? I am pretty new to both Ruby and Postgres
Actually seem to have cracked this one.
I stumbled over this post on Enumberable#group_by
Final code in the controller looks like this;
#programmes = "get all programmes.."
#account_names = #programmes.group_by{|programme| programme.account.name}
In the view I have;
<% #account_names.each_pair do |name, programmes| %>
<hr>
<strong><%= name %> programmes</strong>
<br>
<% programmes.each do |programme| %>
<i><%= programme.name %></i><br>
<% end %>
<% end %>
Remarkable!
Related
I'm new to ruby and rails and coding in general. But I'm working on a project that uses the steam web api to get a list of games owned by a user on steam. I'm trying to take that information and store it in my own table. I was able to get the information into my site but I need to select only one part of the information to pass into my table.
In my users controller I have this for show:
def show
#renders the user page
#user = User.find(params[:id])
#player = SteamWebApi::Player.new(#user.steam_id)
end
In the users show view I have this:
<% user_class = User.new %>
<h2> These are the games you own </h2>
<% #games = #player.owned_games %>
<% #steam_game_ids = user_class.get_steam_id_from_games(#games) %>
<br>
<%= user_class.check_if_games_exit_in_table(#steam_game_ids) %>
The #player.owned_games gives an array of games like this:
[{"appid" => 1234}, "something" => 23123}, {"appid" =>...}]
In my users model I define these methods:
def get_steam_id_from_games(games)
games.games.map{|x| x.values[0]}
end
def check_if_games_exist_in_table(steam_ids)
string_ids = steam_ids.map(&:to_s) #not converting to string
string_ids.each do |app_id|
if Game.exists?(game_app_id: app_id)
return "this exists"
else
return "#{app_id} doesn't exist"
end
end
end
get_steam_id_from_games makes an array with only the appid values for each game:[1234, 234545,..]
check_if_games_exist_in_table is supposed to take the appid array, converts the items to strings (that's how I store the information in my table), and then checks if there is an object in the table with the same appid.
This is where the problem is for me, the string_ids.each to |app_id| only goes through the first thing in the array. Is this because I'm returning "this exists" or "doesn't exist"? What can I do to fix this problem?
def check_if_games_exist_in_table(steam_ids)
string_ids = steam_ids.map(&:to_s) #not converting to string
array_of_non_existing_ids = []
string_ids.each do |app_id|
if !Game.exists?(game_app_id: app_id)
array_of_non_existing_ids.push app_id
end
end
return "#{array_of_non_existing_ids.join(',')} doesn't exist" if array_of_non_existing_ids.any?
return "this exists"
end
I have the following Yaml:
role::test::logos::filesanddata:
logo01.jpg:
title01: 'value01'
title02: 'value02'
title03: 'value03'
title04: 'value04'
title05: 'value05'
title06: 'value06'
title07:
- title07_01: value07_01
- title07_02: value07_02
- title07_03: value07_03
- title07_04: value07_03
- title07_05: value07_04
logo02.jpg:
title01: 'value01'
Through my Class (in Puppet code) am getting the following result:
["logo01.jpg", {"title01"=>"value01", "title02"=>"value02", "title03"=>"value03", "title04"=>"value04", "title05"=>"value05", "title06"=>"value06", "title07"=>[{"title07_01"=>"value07_01"}, {"title07_02"=>"value07_02"}, {"title07_03"=>"value07_03"}, {"title07_04"=>"value07_04"}, {"title07_05"=>"value07_05}]}]
["logo02.jpg", {"title01"=>"value01"}]
I am writing a template to split the data in multiple files (so far works). I am stuck on the item "title07", how should I continue the loop from there?
<%= #arraydata[0] %>
<% #arraydata.shift -%>
<% #arraydata.each do |item| -%>
<%= item['title01'] %>
<%= item['title02'] %>
<%= item['title03'] %>
<%= item['title04'] %>
<%= item['title05'] %>
<%= item['title06'] %>
<% item['title07'].each do |inner_item| -%>
<%= inner_item['title07']['title07_01'] %>
<% end -%>
<% end -%>
Its not clear to me what the end goal is however hopefully the below example should help you unblock the issues you have
given the following hiera data:
role::test::logos::filesanddata:
logo01.jpg:
title01: 'value01'
title02: 'value02'
title03: 'value03'
title04: 'value04'
title05: 'value05'
title06: 'value06'
title07:
- title07_01: value07_01
- title07_02: value07_02
- title07_03: value07_03
- title07_04: value07_03
- title07_05: value07_04
logo02.jpg:
title01: 'value01'
The following code assuming filesanddata = lookup('role::test::logos::filesanddata')
<% #filesanddata.each_pair do |file, titles| -%>
<%- titles.each_pair do |title, values| -%>
<%- if values.is_a?(String) -%>
<%= value %>
<%- elsif value.is_a?(Array) -%>
<%# As mentioned by John Bollinger you have an array %>
<%# of hashes so we have to unpack that as well %>
<%- values.each do |value_hash| -%>
<%- value_hash.each_pair do |_, value| -%>
<%= value %>
<%- end -%>
<%- end -%>
<%- end -%>
<%- end -%>
<% end -%>
would create a file with the following content
value01
value02
value03
value04
value05
value06
value07_01
value07_02
value07_03
value07_03
value07_04
value01
There seems to be confusion both in the data and in the ERB about how the data are structured. This YAML ...
title07:
- title07_01: value07_01
- title07_02: value07_02
- title07_03: value07_03
- title07_04: value07_03
- title07_05: value07_04
... provides an array of single-key hashes as the value of the host hash's 'title07' key. That's not necessarily wrong, but it's very suspicious. It's unclear what thge array layer is supposed to be doing for you, relative to making the data a single five-element hash.
Consider the ERB presented in light of that data structure. Here ...
<% item['title07'].each do |inner_item| -%>
... item['title07'] is an array of single-key hashes, so each inner_item is one of those hashes. The one key appearing in that hash varies from hash to hash, which makes these unnecessarily difficult to work with. None of the keys is 'title07', however, so this will break:
<%= inner_item['title07']['title07_01'] %>
You would need something along the lines of
<%= inner_item['title07_01'] %>
, but accounting for the fact that the key differs from inner_item to inner_item. If you really want to try to work with that, then you might find it useful to use each_with_index instead of each, so that you can construct the needed hash key from the array index. Alternatively, you could just iterate the inner hash to get the value.
But that demonstrates some of the infelicities of that data structure. Suppose that you instead structured the data as a single multi-key hash, bypassing the array level:
title07:
title07_01: value07_01
title07_02: value07_02
title07_03: value07_03
title07_04: value07_03
title07_05: value07_04
Then iterating over the entries probably gets you what you want more directly:
<% item['title07'].each do |_, value| -%>
<%= value %>
<% end -%>
Alternatively, since the keys have a computable form you can compute the keys with which to retrieve the leaf data:
<% 1...5.each do |i| -%>
<%= item['title07']["title07_0#{i}"] %>
<% end -%>
Similar could be made to work with your array-based structure, too, but the needed expression would be more complex (and is left as an exercise).
I have a hash, built from yaml via stdlib, which includes arrays within the hash. Here is a sample of the yaml:
datacenter1:
propertyA:
- associatedItem
cage1:
serviceA:
- server1
- server2
serviceB:
- server10
backupCage:
cage2
cage2:
serviceA:
- server3
- server4
- server5
serviceB:
- server11
backupCage:
cage1
datacenter2:
cage1:
serviceA:
- server20
- server21
datacenter3:
propertyZ:
serviceD:
- server200
- server201
in this case I need to get a list of servers which offer a service within a particular datacenter in erb. Ultimately this is just going to need to output in text with some arbitrary data added for an conf file. I'm trying to get all servers providing serviceA for a given datacenter, in this example for datacenter1:
thiscommand blahblah server1
thiscommand blahblah server2
thiscommand blahblah server3
thiscommand blahblah server4
thiscommand blahblah server5
I use this map extensively for a variety of things, but this is the first case in which i can't just set a variable in puppet and iterate over that as a single array in erb.
EDIT1:
This data comes from puppet but i am trying to use it in erb via template().
EDIT2:
Note this code would never run against datacenter3, since this code is specific to datacenters which run serviceA.
Edit3:
This is the form that ended up working:
<% #hash['datacenter1'].values.each do |v| %>
<%- if v.is_a?(Hash) and v.has_key?('serviceA') -%>
<% v['serviceA'].each do |myservice| %>
thiscommand blah blah <%= myservice -%>
<% end %>
<% end %>
It is unclear if you are trying to do this within Puppet or Ruby, so here is how to do it within both.
Puppet:
$hash['datacenter1'].each |$dc_key, $dc_nest_hash| {
if $dc_nest_hash['serviceA'] {
$dc_nest_hash['serviceA'].each |$serviceA_element| {
notify { "thiscommand blahblah ${serviceA_element}": }
}
}
}
https://docs.puppet.com/puppet/4.9/function.html#each
Ruby in ERB before passed through Puppet template function (comments are elucidation for this answer; remove before actually forming template):
<% #hash['datacenter1'].each do |_, dc_nest_hash| -%>
# contents of each datacenter1 nested hash in dc_nest_hash and iterate over each hash
<%- if dc_nest_hash.key?('serviceA') -%>
<%- dc_nest_hash['serviceA'].each do |serviceA_element| -%>
# lookup serviceA key in each dc_nest_hash and iterate over elements
thiscommand blahblah <%= serviceA_element %>
<%- end -%>
<%- end -%>>
<% end -%>
https://ruby-doc.org/core-2.1.1/Object.html#method-i-enum_for
http://ruby-doc.org/core-2.1.0/Array.html#method-i-each
Rails5, none of the array methods are working in a partial view. If the recipient column is an array:
<%= #mail.recipients.first %>
Brings up:
ActionView::Template::Error (undefined method `first' for nil:NilClass):
It works fine if I do a binding.pry before it and do the same thing in the console. However, if I do:
<%= #mail.recipients %>
It gives me the full array. Just wondering if array methods are not accessible in views?
EDIT:
<%= #mail %>
gives me
#<Mail::ActiveRecord_Relation:0x007f3658bf4f38>
then i put it through
<% #mail.each do |mail| %>
and inside that i do
<%= mail %>
it gives me
<Mail:0x007f3668951618>
then i do
<%= mail.recipients.class %>
it gives me
Array
then i do
<%= mail.recipients.first %>
it gives me
ActionView::Template::Error (undefined method `first' for nil:NilClass):
You should have somthing like this :
class Mail < ActiveRecord::Base
has_many :recipients
....
end
class Recipient < ActiveRecord::Base
belongs_to :mail
....
end
And before calling mail.recipients.first, make sure you already defined to the 'mail' some 'recipients'.
For example, within a model/data-set/table (technical term?) called "microposts" if I have id and user_id columns, to compare the two sets I can use
Micropost.where("user_id = ?", id)
I am wondering, however, how to do the same thing with data from different data-sets/tables/models. In this particular scenario I am trying to find all instances where a user's community variable is equal to the community variable of any microposts. I'm attempting to match the content of the strings so that all microposts are rendered that have a community variable that matches the current user's community variable. These variables are in string form as #city + #state under the column "community" in the users's and microposts's model/datasets/table. Illustrated:
users table microposts table
user_id community micropost_id content community
1 FairfieldIowa 1 blub! FairfieldIowa
2 FairfieldIowa 2 Hiiy FairfieldIowa
3 Salt Lake CityUtah 3 wwowt! Salt Lake CityUtah
4 Salt Lake CityUtah 4 hey Salt Lake CityUtah
5 FairfieldIowa 5 sweet FairfieldIowa
I thought this might work in the User model:
def communityfeed
Micropost.where("community = ?", user.community)
end
However, it is incorrect because of syntax, logic, or because "user" does not define all users, I think.
Then I defined communityfeed_items in a pages_controller as:
def home
if logged_in?
#micropost = current_user.microposts.build
#communityfeed_items = communityfeed.paginate(page: params[:page])
end
end
But I get an undefined local variable or method communityfeed error
This could be because I'm not providing any user to use the method on. Perhaps simply using a variable for all users will solve my problem, but this is something I could not find. I've tried all_users, and user, with no success. Is it possible to compare variables to render a result in this way, and if so, what is the syntax to cycle through all user/microposts and check for these matches?
I also built several partials to function together to render the microposts, however, without the #communityfeed_items variable functioning correctly, they are of little use.
_communityfeed.html.erb
<% if #communityfeed_items.any? %>
<ol class="microposts">
<%= render partial: 'shared/communityfeed_item', collection: #communityfeed_items %>
</ol>
<%= will_paginate #communityfeed_items %>
<% end %>
_communityfeed_items.html.erb
<li id="<%= communityfeed_item.id %>">
<%= link_to gravatar_for(communityfeed_item.user), communityfeed_item.user %>
<span class="user">
<%= link_to communityfeed_item.user.name, communityfeed_item.user %>
</span>
<span class="content"><%= communityfeed_item.content %></span>
<span class="timestamp">
Posted <%= time_ago_in_words(communityfeed_item.created_at) %> ago.
</span>
<% if current_user?(communityfeed_item.user) %>
<%= link_to "delete", communityfeed_item, method: :delete,
confirm: "You sure?",
title: communityfeed_item.content %>
<% end %>
</li>
If I have approached this problem in a severely inefficient/impossible way, I am open to suggestions.
Thanks for your time, generosity, and expertise.