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src/apps/datatables/views.py

Summary

Maintainability
D
2 days
Test Coverage

Function aggregate has a Cognitive Complexity of 21 (exceeds 5 allowed). Consider refactoring.
Open

def aggregate(request, repo, table, agg_type, col_name):
    username = request.user.get_username()
    manager = DataHubManager(username)
    repos = get_repos(manager)
    # Ensure that the repo exists.
Severity: Minor
Found in src/apps/datatables/views.py - About 2 hrs to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Cyclomatic complexity is too high in function aggregate. (12)
Open

@login_required
def aggregate(request, repo, table, agg_type, col_name):
    username = request.user.get_username()
    manager = DataHubManager(username)
    repos = get_repos(manager)
Severity: Minor
Found in src/apps/datatables/views.py by radon

Cyclomatic Complexity

Cyclomatic Complexity corresponds to the number of decisions a block of code contains plus 1. This number (also called McCabe number) is equal to the number of linearly independent paths through the code. This number can be used as a guide when testing conditional logic in blocks.

Radon analyzes the AST tree of a Python program to compute Cyclomatic Complexity. Statements have the following effects on Cyclomatic Complexity:

Construct Effect on CC Reasoning
if +1 An if statement is a single decision.
elif +1 The elif statement adds another decision.
else +0 The else statement does not cause a new decision. The decision is at the if.
for +1 There is a decision at the start of the loop.
while +1 There is a decision at the while statement.
except +1 Each except branch adds a new conditional path of execution.
finally +0 The finally block is unconditionally executed.
with +1 The with statement roughly corresponds to a try/except block (see PEP 343 for details).
assert +1 The assert statement internally roughly equals a conditional statement.
Comprehension +1 A list/set/dict comprehension of generator expression is equivalent to a for loop.
Boolean Operator +1 Every boolean operator (and, or) adds a decision point.

Source: http://radon.readthedocs.org/en/latest/intro.html

Function schema has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring.
Open

def schema(request, repo, table):
    username = request.user.get_username()
    manager = DataHubManager(username)
    repos = get_repos(manager)
    if repos is not None and repo in repos:
Severity: Minor
Found in src/apps/datatables/views.py - About 45 mins to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Avoid deeply nested control flow statements.
Open

                    if c_name == col_name and can_apply(agg_type, col_name):
                        result = manager.execute_sql(
                            "SELECT %s(%s) FROM %s.%s" % (agg_type.lower(), col_name.lower(), repo, table))
                        if "tuples" in result and len(result["tuples"]) > 0 and len(result["tuples"][0]) > 0:
                            return json_response({"value": result["tuples"][0]})
Severity: Major
Found in src/apps/datatables/views.py - About 45 mins to fix

    Function aggregate has 5 arguments (exceeds 4 allowed). Consider refactoring.
    Open

    def aggregate(request, repo, table, agg_type, col_name):
    Severity: Minor
    Found in src/apps/datatables/views.py - About 35 mins to fix

      Similar blocks of code found in 2 locations. Consider refactoring.
      Open

      @login_required
def schema(request, repo, table):
    username = request.user.get_username()
    manager = DataHubManager(username)
    repos = get_repos(manager)
      Severity: Major
      Found in src/apps/datatables/views.py and 1 other location - About 1 day to fix
      src/apps/dataq/views.py on lines 142..153

      Duplicated Code

      Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

      Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

      When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

      Tuning

      This issue has a mass of 133.

      We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

      The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

      If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

      See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

      Refactorings

      Further Reading

      Identical blocks of code found in 2 locations. Consider refactoring.
      Open

      def get_tables(manager, repo_name):
    tables = manager.list_tables(repo_name)
    if len(tables) > 0:
        return tables
    return None
      Severity: Major
      Found in src/apps/datatables/views.py and 1 other location - About 1 hr to fix
      src/apps/dataq/views.py on lines 65..69

      Duplicated Code

      Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

      Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

      When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

      Tuning

      This issue has a mass of 38.

      We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

      The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

      If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

      See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

      Refactorings

      Further Reading

      Identical blocks of code found in 2 locations. Consider refactoring.
      Open

      def get_repos(manager):
    repos = manager.list_repos()
    if len(repos) > 0:
        return repos
    return None
      Severity: Minor
      Found in src/apps/datatables/views.py and 1 other location - About 45 mins to fix
      src/apps/dataq/views.py on lines 48..52

      Duplicated Code

      Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

      Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

      When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

      Tuning

      This issue has a mass of 35.

      We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

      The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

      If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

      See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

      Refactorings

      Further Reading

      Identical blocks of code found in 2 locations. Consider refactoring.
      Open

      def json_response(json_dict):
    json_dict["success"] = True
    return HttpResponse(json.dumps(json_dict),
      Severity: Minor
      Found in src/apps/datatables/views.py and 1 other location - About 40 mins to fix
      src/apps/dataq/views.py on lines 19..21

      Duplicated Code

      Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

      Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

      When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

      Tuning

      This issue has a mass of 34.

      We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

      The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

      If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

      See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

      Refactorings

      Further Reading

      Line too long (109 > 79 characters)
      Open

                              if "tuples" in result and len(result["tuples"]) > 0 and len(result["tuples"][0]) > 0:
      Severity: Minor
      Found in src/apps/datatables/views.py by pep8

      Limit all lines to a maximum of 79 characters.

      There are still many devices around that are limited to 80 character
lines; plus, limiting windows to 80 characters makes it possible to
have several windows side-by-side.  The default wrapping on such
devices looks ugly.  Therefore, please limit all lines to a maximum
of 79 characters. For flowing long blocks of text (docstrings or
comments), limiting the length to 72 characters is recommended.

Reports error E501.

      Line too long (80 > 79 characters)
      Open

                                  return json_response({"value": result["tuples"][0]})
      Severity: Minor
      Found in src/apps/datatables/views.py by pep8

      Limit all lines to a maximum of 79 characters.

      There are still many devices around that are limited to 80 character
lines; plus, limiting windows to 80 characters makes it possible to
have several windows side-by-side.  The default wrapping on such
devices looks ugly.  Therefore, please limit all lines to a maximum
of 79 characters. For flowing long blocks of text (docstrings or
comments), limiting the length to 72 characters is recommended.

Reports error E501.

      Line too long (104 > 79 characters)
      Open

                          "integer", "int", "int4", "real", "float4", "smallint", "int2", "serial", "serial4"]
      Severity: Minor
      Found in src/apps/datatables/views.py by pep8

      Limit all lines to a maximum of 79 characters.

      There are still many devices around that are limited to 80 character
lines; plus, limiting windows to 80 characters makes it possible to
have several windows side-by-side.  The default wrapping on such
devices looks ugly.  Therefore, please limit all lines to a maximum
of 79 characters. For flowing long blocks of text (docstrings or
comments), limiting the length to 72 characters is recommended.

Reports error E501.

      Line too long (91 > 79 characters)
      Open

          number_types = ["bigint", "int8", "bigserial", "serial8", "double precision", "float8",
      Severity: Minor
      Found in src/apps/datatables/views.py by pep8

      Limit all lines to a maximum of 79 characters.

      There are still many devices around that are limited to 80 character
lines; plus, limiting windows to 80 characters makes it possible to
have several windows side-by-side.  The default wrapping on such
devices looks ugly.  Therefore, please limit all lines to a maximum
of 79 characters. For flowing long blocks of text (docstrings or
comments), limiting the length to 72 characters is recommended.

Reports error E501.

      Line too long (107 > 79 characters)
      Open

                                  "SELECT %s(%s) FROM %s.%s" % (agg_type.lower(), col_name.lower(), repo, table))
      Severity: Minor
      Found in src/apps/datatables/views.py by pep8

      Limit all lines to a maximum of 79 characters.

      There are still many devices around that are limited to 80 character
lines; plus, limiting windows to 80 characters makes it possible to
have several windows side-by-side.  The default wrapping on such
devices looks ugly.  Therefore, please limit all lines to a maximum
of 79 characters. For flowing long blocks of text (docstrings or
comments), limiting the length to 72 characters is recommended.

Reports error E501.

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