module ActiveScaffold::Constraints
Public Class Methods
# File lib/active_scaffold/constraints.rb, line 3 def self.included(base) base.helper_method :active_scaffold_constraints end
Protected Instance Methods
Returns the current constraints
# File lib/active_scaffold/constraints.rb, line 10 def active_scaffold_constraints @active_scaffold_constraints ||= active_scaffold_embedded_params[:constraints] || {} end
Applies constraints to the given record.
Searches through the known columns for association columns. If the given constraint is an association, it assumes that the constraint value is an id. It then does a association.klass.find with the value and adds the associated object to the record.
For some operations ActiveRecord
will automatically update the database. That’s not always ok. If it is ok (e.g. you’re in a transaction), then set :allow_autosave to true.
# File lib/active_scaffold/constraints.rb, line 155 def apply_constraints_to_record(record, options = {}) options[:allow_autosave] = false if options[:allow_autosave].nil? constraints = options[:constraints] || active_scaffold_constraints config = record.is_a?(active_scaffold_config.model) ? active_scaffold_config : active_scaffold_config_for(record.class) constraints.each do |k, v| column = config.columns[k] if column&.association if column.association.collection? record.send(k.to_s).send(:<<, column.association.klass.find(v)) elsif column.association.polymorphic? unless v.is_a?(Array) && v.size >= 2 raise ActiveScaffold::MalformedConstraint, polymorphic_constraint_error(column.association), caller end record.send("#{k}=", v[0].constantize.find(v[1])) if v.size == 2 elsif !column.association.source_reflection&.options&.include?(:through) && # regular singular association, or one-level through association !v.is_a?(Array) record.send("#{k}=", column.association.klass.find(v)) # setting the belongs_to side of a has_one isn't safe. if the has_one was already # specified, rails won't automatically clear out the previous associated record. # # note that we can't take the extra step to correct this unless we're permitted to # run operations where activerecord auto-saves the object. reverse = column.association.reverse_association if reverse.singular? && !reverse.belongs_to? && options[:allow_autosave] record.send(k).send("#{reverse.name}=", record) end end else record.send("#{k}=", v) end end end
We do NOT want to use .search_sql. If anything, search_sql will refer to a human-searchable value on the associated record.
# File lib/active_scaffold/constraints.rb, line 110 def condition_from_association_constraint(association, value) # when the reverse association is a :belongs_to, the id for the associated object only exists as # the primary_key on the other table. so for :has_one and :has_many (when the reverse is :belongs_to), # we have to use the other model's primary_key. # # please see the relevant tests for concrete examples. field = if association.belongs_to? association.foreign_key else association.klass.primary_key end table = association.belongs_to? ? active_scaffold_config.model.table_name : association.table_name value = association.klass.find(value).send(association.primary_key) if association.primary_key if association.polymorphic? unless value.is_a?(Array) && value.size >= 2 raise ActiveScaffold::MalformedConstraint, polymorphic_constraint_error(association), caller end condition = {table => {association.foreign_type => value[0], field => value.size == 2 ? value[1] : value[1..-1]}} else condition = {table => {field.to_s => value}} end condition end
Returns search conditions based on the current scaffold constraints.
Supports constraints based on either a column name (in which case it checks for an association or just uses the search_sql) or a database field name.
All of this work is primarily to support nested scaffolds in a manner generally useful for other embedded scaffolds.
# File lib/active_scaffold/constraints.rb, line 58 def conditions_from_constraints hash_conditions = {} conditions = [hash_conditions] active_scaffold_constraints.each do |k, v| column = active_scaffold_config.columns[k] if column # Assume this is a multi-level association constraint. # example: # data model: Park -> Den -> Bear # constraint: :den => {:park => 5} if params_hash? v far_association = column.association.klass.reflect_on_association(v.keys.first) field = far_association.klass.primary_key table = far_association.table_name active_scaffold_references.concat([{k => far_association.name}]) # e.g. {:den => :park} hash_conditions.deep_merge!(table => {field => v.values.first}) # association column constraint elsif column.association join_from_association_constraint(column) hash_conditions.deep_merge!(condition_from_association_constraint(column.association, v)) # regular column constraints elsif column.searchable? && params[column.name] != v active_scaffold_references.concat column.references if column.includes.present? conditions << [column.search_sql.collect { |search_sql| "#{search_sql} = ?" }.join(' OR '), *([v] * column.search_sql.size)] end # unknown-to-activescaffold-but-real-database-column constraint elsif active_scaffold_config._columns_hash[k.to_s] && params[column.name] != v hash_conditions.deep_merge!(k => v) else raise ActiveScaffold::MalformedConstraint, constraint_error(active_scaffold_config.model, k), caller end end conditions.reject(&:blank?) end
# File lib/active_scaffold/constraints.rb, line 143 def constraint_error(klass, column_name) "Malformed constraint `#{klass}##{column_name}'. If it's a legitimate column, and you are using a nested scaffold, please specify or double-check the reverse association name." end
# File lib/active_scaffold/constraints.rb, line 96 def join_from_association_constraint(column) if column.association.habtm? active_scaffold_habtm_joins.concat column.includes elsif !column.association.polymorphic? if column.association.belongs_to? active_scaffold_preload.concat column.includes else active_scaffold_references.concat column.includes end end end
# File lib/active_scaffold/constraints.rb, line 139 def polymorphic_constraint_error(association) "Malformed constraint. You have added a constraint for #{association.name} polymorphic association but value is not an array of class name and id." end
# File lib/active_scaffold/constraints.rb, line 14 def register_constraint?(column_name, value) if params_hash?(value) false elsif value.is_a?(Array) column = active_scaffold_config.columns[column_name] column && value.size > (column.association&.polymorphic? ? 2 : 1) else true end end
For each enabled action, adds the constrained columns to the ActionColumns object (if it exists). This lets the ActionColumns object skip constrained columns.
If the constraint value is a Hash, then we assume the constraint is a multi-level association constraint (the reverse of a has_many :through) and we do NOT register the constraint column. If the constraint value is an Array, or Array with more than 2 items for polymorphic column, we do NOT register the constraint column, as records will have different values in the column.
# File lib/active_scaffold/constraints.rb, line 32 def register_constraints_with_action_columns(constrained_fields = nil) constrained_fields ||= [] constrained_fields |= active_scaffold_constraints.select { |k, v| register_constraint?(k, v) }.keys.collect(&:to_sym) exclude_actions = [] %i[list update].each do |action_name| if active_scaffold_config.actions.include? action_name exclude_actions << action_name unless active_scaffold_config.send(action_name).hide_nested_column end end # we actually want to do this whether constrained_fields exist or not, so that we can reset the array when they don't active_scaffold_config.actions.each do |action_name| next if exclude_actions.include?(action_name) action = active_scaffold_config.send(action_name) next unless action.respond_to? :columns action.columns.constraint_columns = constrained_fields end end