fix for count in Pagy::Backend (#36)

docs/api/backend.md

@@ -48,7 +48,7 @@ For example: here is a `pagy` method that doesn't call any sub-method, that may
 
 ```ruby
 def pagy_custom(collection, vars={})
- pagy = Pagy.new(count: collection.count, page: params[:page], **vars)
+ pagy = Pagy.new(count: collection.count(:all), page: params[:page], **vars)
  return pagy, collection.offset(pagy.offset).limit(pagy.items)
 end
 ```
@@ -63,7 +63,7 @@ Here is its source:
 # sub-method called only by #pagy: here for easy customization of variables by overriding
 def pagy_get_vars(collection, vars)
  # return the merged variables to initialize the pagy object
- { count: collection.count,
+ { count: collection.count(:all),
  page: params[vars[:page_param]||VARS[:page_param]] }.merge!(vars)
 end
 ```

docs/how-to.md

@@ -328,7 +328,7 @@ end
 def cache_count(collection)
  cache_key = "pagy-#{collection.model.name}:#{collection.to_sql}"
  Rails.cache.fetch(cache_key, expires_in: 20 * 60) do
- collection.count
+ collection.count(:all)
  end
 end
 
@@ -353,7 +353,7 @@ You can do so by setting the `:item_path` variable to the path to lookup in the
 1. by overriding the `pagy_get_vars` method in your controller (valid for all the pagy instances) adding the `:item_path`. For example (with ActiveRecord):
  ```ruby
  def pagy_get_vars(collection, vars)
- { count: collection.count,
+ { count: collection.count(:all),
  page: params[vars[:page_param]||Pagy::VARS[:page_param]],
  item_path: "activerecord.models.#{collection.model_name.i18n_key}" }.merge!(vars)
  end

lib/pagy/backend.rb

@@ -18,7 +18,7 @@ def pagy(collection, vars={})
  # sub-method called only by #pagy: here for easy customization of variables by overriding
  def pagy_get_vars(collection, vars)
  # return the merged variables to initialize the pagy object
- { count: collection.count,
+ { count: collection.count(:all),
  page: params[vars[:page_param]||VARS[:page_param]] }.merge!(vars)
  end