Class: QueryHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/query_helper.rb,
lib/query_helper/filter.rb,
lib/query_helper/version.rb,
lib/query_helper/sql_sort.rb,
lib/query_helper/column_map.rb,
lib/query_helper/sql_filter.rb,
lib/query_helper/sql_parser.rb,
lib/query_helper/associations.rb,
lib/query_helper/sql_manipulator.rb,
lib/query_helper/invalid_query_error.rb,
lib/query_helper/query_helper_concern.rb

Defined Under Namespace

Modules: QueryHelperConcern Classes: Associations, ColumnMap, Filter, InvalidQueryError, SqlFilter, SqlManipulator, SqlParser, SqlSort

Constant Summary collapse

VERSION = 
"0.4.0"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model: nil, query: nil, bind_variables: {}, sql_filter: SqlFilter.new(), sql_sort: SqlSort.new(), page: nil, per_page: nil, single_record: false, associations: [], as_json_options: nil, custom_mappings: {}, api_payload: false, preload: [], search_fields: [], search_string: nil, metadata: {}) ⇒ QueryHelper

Returns a new instance of QueryHelper.



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# File 'lib/query_helper.rb', line 19

def initialize(
  model: nil, # the model to run the query against
  query: nil, # a sql string or an active record query
  bind_variables: {}, # a list of bind variables to be embedded into the query
  sql_filter: SqlFilter.new(), # a SqlFilter object
  sql_sort: SqlSort.new(), # a SqlSort object
  page: nil, # define the page you want returned
  per_page: nil, # define how many results you want per page
  single_record: false, # whether or not you expect the record to return a single result, if toggled, only the first result will be returned
  associations: [], # a list of activerecord associations you'd like included in the payload
  as_json_options: nil, # a list of as_json options you'd like run before returning the payload
  custom_mappings: {}, # custom keyword => sql_expression mappings
  api_payload: false, # Return the paginated payload or simply return the result array
  preload: [], # preload activerecord associations - used instead of `associations` when you don't want them included in the payload
  search_fields: [],
  search_string: nil,
  metadata: {}
)
  @query = query.class < ActiveRecord::Relation ? query.to_sql : query
  @model = query.class < ActiveRecord::Relation ? query.base_class : model
  @bind_variables = bind_variables
  @sql_filter = sql_filter
  @sql_sort = sql_sort
  @page = determine_page(page: page, per_page: per_page)
  @per_page = determine_per_page(page: page, per_page: per_page)
  set_limit_and_offset()
  @single_record = single_record
  @associations = associations
  @as_json_options = as_json_options
  @custom_mappings = custom_mappings
  @api_payload = api_payload
  @preload = preload
  @search_fields = search_fields
  @search_string = search_string
  @metadata = metadata
end

Instance Attribute Details

#api_payload ⇒ Object

Returns the value of attribute api_payload.



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# File 'lib/query_helper.rb', line 16

def api_payload
  @api_payload
end

#as_json_options ⇒ Object

Returns the value of attribute as_json_options.



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# File 'lib/query_helper.rb', line 16

def as_json_options
  @as_json_options
end

#associations ⇒ Object

Returns the value of attribute associations.



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# File 'lib/query_helper.rb', line 16

def associations
  @associations
end

#bind_variables ⇒ Object

Returns the value of attribute bind_variables.



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# File 'lib/query_helper.rb', line 16

def bind_variables
  @bind_variables
end

#executed_query ⇒ Object

Returns the value of attribute executed_query.



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# File 'lib/query_helper.rb', line 16

def executed_query
  @executed_query
end

#metadata ⇒ Object

Returns the value of attribute metadata.



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# File 'lib/query_helper.rb', line 16

def metadata
  @metadata
end

#model ⇒ Object

Returns the value of attribute model.



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# File 'lib/query_helper.rb', line 16

def model
  @model
end

#page ⇒ Object

Returns the value of attribute page.



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# File 'lib/query_helper.rb', line 16

def page
  @page
end

#per_page ⇒ Object

Returns the value of attribute per_page.



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# File 'lib/query_helper.rb', line 16

def per_page
  @per_page
end

#preload ⇒ Object

Returns the value of attribute preload.



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# File 'lib/query_helper.rb', line 16

def preload
  @preload
end

#query ⇒ Object

Returns the value of attribute query.



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# File 'lib/query_helper.rb', line 17

def query
  @query
end

#search_field ⇒ Object

Returns the value of attribute search_field.



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# File 'lib/query_helper.rb', line 16

def search_field
  @search_field
end

#search_string ⇒ Object

Returns the value of attribute search_string.



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# File 'lib/query_helper.rb', line 16

def search_string
  @search_string
end

#single_record ⇒ Object

Returns the value of attribute single_record.



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# File 'lib/query_helper.rb', line 16

def single_record
  @single_record
end

#sql_filter ⇒ Object

Returns the value of attribute sql_filter.



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# File 'lib/query_helper.rb', line 16

def sql_filter
  @sql_filter
end

#sql_sort ⇒ Object

Returns the value of attribute sql_sort.



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# File 'lib/query_helper.rb', line 16

def sql_sort
  @sql_sort
end

Instance Method Details

#add_filter(operator_code:, criterion:, comparate:) ⇒ Object 



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# File 'lib/query_helper.rb', line 98

def add_filter(operator_code:, criterion:, comparate:)
  @sql_filter.filter_values["comparate"] = { operator_code => criterion }
end

#build_query ⇒ Object 



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# File 'lib/query_helper.rb', line 112

def build_query
  # Create column maps to be used by the filter and sort objects
  column_maps = create_column_maps()

  @sql_filter.column_maps = column_maps
  @sql_sort.column_maps = column_maps

  # create the filters from the column maps
  @sql_filter.create_filters()

  having_clauses = @sql_filter.having_clauses
  where_clauses = @sql_filter.where_clauses
  qualify_clauses = @sql_filter.qualify_clauses

  if @search_string
    search_filter = search_filter(column_maps)
    if search_filter[:placement] == :where
      where_clauses << search_filter[:filter]
    else
      having_clauses << search_filter[:filter]
    end
  end


  # merge the filter bind variables into the query bind variables
  @bind_variables.merge!(@sql_filter.bind_variables)

  # Execute Sql Query
  manipulator = SqlManipulator.new(
    sql: @query,
    where_clauses: where_clauses,
    having_clauses: having_clauses,
    qualify_clauses: qualify_clauses,
    order_by_clauses: @sql_sort.parse_sort_string,
    include_limit_clause: @page && @per_page ? true : false,
    additional_select_clauses:  @sql_sort.select_strings
  )
  manipulator.build()
end

#execute_query ⇒ Object 



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# File 'lib/query_helper.rb', line 171

def execute_query
  query = build_query()
  @results = @model.find_by_sql([query, @bind_variables]) # Execute Sql Query
  @results = @results.first if @single_record # Return a single result if requested

  determine_count()
  preload_associations()
  load_associations()
  clean_results()
end

#pagination_results(count = @count) ⇒ Object 



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# File 'lib/query_helper.rb', line 188

def pagination_results(count=@count)
  # Set pagination params if they aren't provided
  results_per_page = @per_page || count
  results_page = @page || 1

  total_pages = (count.to_i/(results_per_page.nonzero? || 1).to_f).ceil
  next_page = results_page + 1 if results_page.between?(1, total_pages - 1)
  previous_page = results_page - 1 if results_page.between?(2, total_pages)
  first_page = results_page == 1
  last_page = results_page >= total_pages
  out_of_range = !results_page.between?(1,total_pages)

  { count: count,
    current_page: results_page,
    next_page: next_page,
    previous_page: previous_page,
    total_pages: total_pages,
    per_page: results_per_page,
    first_page: first_page,
    last_page: last_page,
    out_of_range: out_of_range }
end

#results ⇒ Object 



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# File 'lib/query_helper.rb', line 182

def results
  execute_query()
  return paginated_results() if @api_payload
  return @results
end

#to_json(args) ⇒ Object 



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# File 'lib/query_helper.rb', line 152

def to_json(args)
  results.to_json
end

#to_sql ⇒ Object 



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# File 'lib/query_helper.rb', line 156

def to_sql
  query = build_query()
  return query if @bind_variables.length == 0
  begin
    return @model.sanitize_sql_array([query, @bind_variables])
  rescue NoMethodError
    # sanitize_sql_array is a protected method before Rails v5.2.3
    return @model.send(:sanitize_sql_array, [query, @bind_variables])
  end
end

#update(query: nil, model: nil, bind_variables: {}, filters: [], associations: [], as_json_options: nil, single_record: nil, custom_mappings: nil, preload: [], search_fields: nil, sql_filter: nil, sql_sort: nil, sort_tiebreak: nil, column_sort_order: nil, page: nil, per_page: nil, search_string: nil, metadata: nil) ⇒ Object 



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# File 'lib/query_helper.rb', line 56

def update(
  query: nil,
  model: nil,
  bind_variables: {},
  filters: [],
  associations: [],
  as_json_options: nil,
  single_record: nil,
  custom_mappings: nil,
  preload: [],
  search_fields: nil,
  sql_filter: nil,
  sql_sort: nil,
  sort_tiebreak: nil,
  column_sort_order: nil,
  page: nil,
  per_page: nil,
  search_string: nil,
  metadata: nil
)
  @query = query.class < ActiveRecord::Relation ? query.to_sql : query if query
  @model = query.class < ActiveRecord::Relation ? query.base_class : model if model || query
  @bind_variables.merge!(bind_variables)
  filters.each{ |f| add_filter(**f) }
  @associations = @associations | associations
  @single_record = single_record if single_record
  @as_json_options = as_json_options if as_json_options
  @custom_mappings = custom_mappings if custom_mappings
  @preload = preload if preload
  @search_fields = search_fields if search_fields
  @sql_filter = sql_filter if sql_filter
  @sql_sort = sql_sort if sql_sort
  @sql_sort.sort_tiebreak = sort_tiebreak if sort_tiebreak
  @sql_sort.column_sort_order = column_sort_order if column_sort_order
  @search_string = search_string if search_string
  @page = determine_page(page: page, per_page: per_page) if page
  @per_page = determine_per_page(page: page, per_page: per_page) if per_page
  @metadata = metadata if metadata
  set_limit_and_offset()
  return self
end

#view_query ⇒ Object 



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# File 'lib/query_helper.rb', line 167

def view_query
  to_sql
end