Class: Mongoid::Contexts::Mongo
Instance Attribute Summary collapse
-
#criteria ⇒ Object
Returns the value of attribute criteria.
Instance Method Summary collapse
-
#add_to_set(field, value) ⇒ Object
Perform an add to set on the matching documents.
-
#aggregate ⇒ Hash
Aggregate the context.
-
#avg(field) ⇒ Numeric
Get the average value for the supplied field.
-
#blank? ⇒ true, false
(also: #empty?)
Determine if the context is empty or blank given the criteria.
-
#count(extras = false) ⇒ Integer
(also: #size, #length)
Get the count of matching documents in the database for the context.
-
#delete_all ⇒ Integer
(also: #delete)
Delete all the documents in the database matching the selector.
-
#destroy_all ⇒ Integer
(also: #destroy)
Destroy all the documents in the database matching the selector.
-
#distinct(field) ⇒ Array<Object>
Gets an array of distinct values for the supplied field across the entire collection or the susbset given the criteria.
-
#execute ⇒ Cursor
Execute the context.
-
#first ⇒ Document
(also: #one)
Return the first result for the
Context
. -
#group ⇒ Hash
Groups the context.
-
#initialize(criteria) ⇒ Mongo
constructor
Create the new mongo context.
-
#iterate(&block) ⇒ Object
Iterate over each
Document
in the results. -
#last ⇒ Document
Return the last result for the
Context
. -
#max(field) ⇒ Numeric
Return the max value for a field.
-
#min(field) ⇒ Numeric
Return the min value for a field.
-
#pull(field, value) ⇒ Object
Perform a pull on the matching documents.
-
#shift ⇒ Document
Return the first result for the
Context
and skip it for successive calls. -
#sum(field) ⇒ Numeric
Sum the context.
-
#update_all(attributes = {}) ⇒ Object
(also: #update)
Very basic update that will perform a simple atomic $set of the attributes provided in the hash.
Constructor Details
#initialize(criteria) ⇒ Mongo
Create the new mongo context. This will execute the queries given the selector and options against the database.
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# File 'lib/mongoid/contexts/mongo.rb', line 199 def initialize(criteria) @criteria = criteria if klass.hereditary? && !criteria.selector.keys.include?(:_type) @criteria = criteria.in(:_type => criteria.klass._types) end @criteria.cache if klass.cached? end |
Instance Attribute Details
#criteria ⇒ Object
Returns the value of attribute criteria.
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# File 'lib/mongoid/contexts/mongo.rb', line 5 def criteria @criteria end |
Instance Method Details
#add_to_set(field, value) ⇒ Object
Perform an add to set on the matching documents.
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# File 'lib/mongoid/contexts/mongo.rb', line 21 def add_to_set(field, value) klass.collection.update( selector, { "$addToSet" => { field => value } }, :multi => true ) end |
#aggregate ⇒ Hash
Aggregate the context. This will take the internally built selector and options and pass them on to the Ruby driver’s group() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned it will provided a grouping of keys with counts.
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# File 'lib/mongoid/contexts/mongo.rb', line 38 def aggregate klass.collection.group( :key => field_list, :cond => selector, :initial => { :count => 0 }, :reduce => Javascript.aggregate ) end |
#avg(field) ⇒ Numeric
Get the average value for the supplied field.
This will take the internally built selector and options and pass them on to the Ruby driver’s group() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned it will provided a grouping of keys with averages.
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# File 'lib/mongoid/contexts/mongo.rb', line 60 def avg(field) total = sum(field) total ? (total / count) : nil end |
#blank? ⇒ true, false Also known as: empty?
Determine if the context is empty or blank given the criteria. Will perform a quick has_one asking only for the id.
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# File 'lib/mongoid/contexts/mongo.rb', line 72 def blank? klass.collection.find_one(selector, { :fields => [ :_id ] }).nil? end |
#count(extras = false) ⇒ Integer Also known as: size, length
Get the count of matching documents in the database for the context.
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# File 'lib/mongoid/contexts/mongo.rb', line 89 def count(extras = false) if cached? @count ||= collection.find(selector, ).count(extras) else collection.find(selector, ).count(extras) end end |
#delete_all ⇒ Integer Also known as: delete
Delete all the documents in the database matching the selector.
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# File 'lib/mongoid/contexts/mongo.rb', line 107 def delete_all klass.delete_all(:conditions => selector) end |
#destroy_all ⇒ Integer Also known as: destroy
Destroy all the documents in the database matching the selector.
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# File 'lib/mongoid/contexts/mongo.rb', line 120 def destroy_all klass.destroy_all(:conditions => selector) end |
#distinct(field) ⇒ Array<Object>
Gets an array of distinct values for the supplied field across the entire collection or the susbset given the criteria.
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# File 'lib/mongoid/contexts/mongo.rb', line 134 def distinct(field) klass.collection.distinct(field, selector) end |
#execute ⇒ Cursor
Execute the context. This will take the selector and options and pass them on to the Ruby driver’s find() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned new documents of the type of class provided will be instantiated.
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# File 'lib/mongoid/contexts/mongo.rb', line 147 def execute criteria.inclusions.reject! do || .eager_load(criteria) end klass.collection.find(selector, ) || [] end |
#first ⇒ Document Also known as: one
Return the first result for the Context
.
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# File 'lib/mongoid/contexts/mongo.rb', line 160 def first opts = sorting = opts[:sort] ||= [] sorting << [:_id, :asc] attributes = klass.collection.find_one(selector, opts) attributes ? Mongoid::Factory.from_db(klass, attributes) : nil end |
#group ⇒ Hash
Groups the context. This will take the internally built selector and options and pass them on to the Ruby driver’s group() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned it will provided a grouping of keys with objects.
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# File 'lib/mongoid/contexts/mongo.rb', line 178 def group klass.collection.group( :key => field_list, :cond => selector, :initial => { :group => [] }, :reduce => Javascript.group ).collect do |docs| docs["group"] = docs["group"].collect do |attrs| Mongoid::Factory.from_db(klass, attrs) end docs end end |
#iterate(&block) ⇒ Object
Iterate over each Document
in the results. This can take an optional block to pass to each argument in the results.
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# File 'lib/mongoid/contexts/mongo.rb', line 212 def iterate(&block) return caching(&block) if cached? if block_given? execute.each { |doc| yield doc } end end |
#last ⇒ Document
Return the last result for the Context
. Essentially does a find_one on the collection with the sorting reversed. If no sorting parameters have been provided it will default to ids.
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# File 'lib/mongoid/contexts/mongo.rb', line 227 def last opts = sorting = opts[:sort] ||= [] sorting << [:_id, :asc] opts[:sort] = sorting.map{ |option| [ option[0], option[1].invert ] }.uniq attributes = klass.collection.find_one(selector, opts) attributes ? Mongoid::Factory.from_db(klass, attributes) : nil end |
#max(field) ⇒ Numeric
Return the max value for a field.
This will take the internally built selector and options and pass them on to the Ruby driver’s group() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned it will provided a grouping of keys with sums.
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# File 'lib/mongoid/contexts/mongo.rb', line 249 def max(field) grouped(:max, field.to_s, Javascript.max) end |
#min(field) ⇒ Numeric
Return the min value for a field.
This will take the internally built selector and options and pass them on to the Ruby driver’s group() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned it will provided a grouping of keys with sums.
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# File 'lib/mongoid/contexts/mongo.rb', line 266 def min(field) grouped(:min, field.to_s, Javascript.min) end |
#pull(field, value) ⇒ Object
Perform a pull on the matching documents.
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# File 'lib/mongoid/contexts/mongo.rb', line 281 def pull(field, value) klass.collection.update( selector, { "$pull" => { field => value } }, :multi => true ) end |
#shift ⇒ Document
Return the first result for the Context
and skip it for successive calls.
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# File 'lib/mongoid/contexts/mongo.rb', line 296 def shift first.tap { criteria.skip(([:skip] || 0) + 1) } end |
#sum(field) ⇒ Numeric
Sum the context.
This will take the internally built selector and options and pass them on to the Ruby driver’s group() method on the collection. The collection itself will be retrieved from the class provided, and once the query has returned it will provided a grouping of keys with sums.
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# File 'lib/mongoid/contexts/mongo.rb', line 313 def sum(field) grouped(:sum, field.to_s, Javascript.sum) end |
#update_all(attributes = {}) ⇒ Object Also known as: update
Very basic update that will perform a simple atomic $set of the attributes provided in the hash. Can be expanded to later for more robust functionality.
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# File 'lib/mongoid/contexts/mongo.rb', line 327 def update_all(attributes = {}) klass.collection.update( selector, { "$set" => attributes }, Safety.(:multi => true) ).tap do Threaded. end end |