Python django.db.migrations.swappable_dependency() Examples

The following are 2 code examples for showing how to use django.db.migrations.swappable_dependency(). These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example.

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Example 1
Project: django-swappable-models   Author: wq   File: __init__.py    License: MIT License 5 votes vote down vote up
def dependency(app_label, model):
    """
    Returns a Django 1.7+ style dependency tuple for inclusion in
    migration.dependencies[]
    """
    from django.db.migrations import swappable_dependency
    return swappable_dependency(get_model_name(app_label, model)) 
Example 2
Project: GTDWeb   Author: lanbing510   File: writer.py    License: GNU General Public License v2.0 4 votes vote down vote up
def as_string(self):
        """
        Returns a string of the file contents.
        """
        items = {
            "replaces_str": "",
        }

        imports = set()

        # Deconstruct operations
        operations = []
        for operation in self.migration.operations:
            operation_string, operation_imports = OperationWriter(operation).serialize()
            imports.update(operation_imports)
            operations.append(operation_string)
        items["operations"] = "\n".join(operations) + "\n" if operations else ""

        # Format dependencies and write out swappable dependencies right
        dependencies = []
        for dependency in self.migration.dependencies:
            if dependency[0] == "__setting__":
                dependencies.append("        migrations.swappable_dependency(settings.%s)," % dependency[1])
                imports.add("from django.conf import settings")
            else:
                # No need to output bytestrings for dependencies
                dependency = tuple(force_text(s) for s in dependency)
                dependencies.append("        %s," % self.serialize(dependency)[0])
        items["dependencies"] = "\n".join(dependencies) + "\n" if dependencies else ""

        # Format imports nicely, swapping imports of functions from migration files
        # for comments
        migration_imports = set()
        for line in list(imports):
            if re.match("^import (.*)\.\d+[^\s]*$", line):
                migration_imports.add(line.split("import")[1].strip())
                imports.remove(line)
                self.needs_manual_porting = True
        imports.discard("from django.db import models")
        items["imports"] = "\n".join(imports) + "\n" if imports else ""
        if migration_imports:
            items["imports"] += (
                "\n\n# Functions from the following migrations need manual "
                "copying.\n# Move them and any dependencies into this file, "
                "then update the\n# RunPython operations to refer to the local "
                "versions:\n# %s"
            ) % "\n# ".join(migration_imports)
        # If there's a replaces, make a string for it
        if self.migration.replaces:
            items['replaces_str'] = "\n    replaces = %s\n" % self.serialize(self.migration.replaces)[0]

        return (MIGRATION_TEMPLATE % items).encode("utf8")